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docSidebarContainer_YfHR"><div class="sidebarViewport_aRkj"><div class="sidebar_njMd"><nav aria-label="Docs sidebar" class="menu thin-scrollbar menu_SIkG"><ul class="theme-doc-sidebar-menu menu__list"><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-1 menu__list-item"><a class="menu__link" href="../../index.html">Introduction</a></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../../chap-0/intro.html">Contents and Figures</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../../chap-1/b-b-scope-purpose-and-history.html">1. Introduction</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../../chap-2/c-b-character-syntax.html">2. Syntax</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../../chap-3/d-b-evaluation.html">3. Evaluation and Compilation</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../../chap-4/e-b-introduction.html">4. Types and Classes</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../../chap-5/f-b-generalized-reference.html">5. Data and Control Flow</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../../chap-6/g-b-the-loop-facility.html">6. Iteration</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../../chap-7/h-b-object-creation-and-initialization.html">7. Objects</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../../category/81-structures-dictionary.html">8. Structures</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../../chap-9/j-b-condition-system-concepts.html">9. Conditions</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../../chap-10/ba-b-symbol-concepts.html">10. Symbols</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../../chap-11/bb-b-package-concepts.html">11. Packages</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../../chap-12/bc-b-number-concepts.html">12. Numbers</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../../chap-13/bd-b-character-concepts.html">13. Characters</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../../chap-14/be-b-cons-concepts.html">14. Conses</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../../chap-15/bf-b-array-concepts.html">15. Arrays</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../../chap-16/bg-b-string-concepts.html">16. Strings</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret menu__link--active" aria-expanded="true" href="../bh-b-sequence-concepts.html">17. Sequences</a></div><ul style="display:block;overflow:visible;height:auto" class="menu__list"><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-2 menu__list-item"><a class="menu__link" tabindex="0" href="../bh-b-sequence-concepts.html">17.1 Sequence Concepts</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-2 menu__list-item"><a class="menu__link" tabindex="0" href="../bh-c-rules-about-test-functions.html">17.2 Rules about Test Functions</a></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-2 menu__list-item"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--active" aria-expanded="true" tabindex="0" href="../../category/173-sequences-dictionary.html">17.3 Sequences Dictionary</a><button aria-label="Collapse sidebar category '17.3 Sequences Dictionary'" type="button" class="clean-btn menu__caret"></button></div><ul style="display:block;overflow:visible;height:auto" class="menu__list"><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="concatenate_function.html">concatenate</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="copy-seq_function.html">copy-seq</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="count_count-if_count-if-not_function.html">count, count-if, count-if-not</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="elt_accessor.html">elt</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="fill_function.html">fill</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="find_find-if_find-if-not_function.html">find, find-if, find-if-not</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="length_function.html">length</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="make-sequence_function.html">make-sequence</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="map-into_function.html">map-into</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="map_function.html">map</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="merge_function.html">merge</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="mismatch_function.html">mismatch</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="position_position-if_position-if-not_function.html">position, position-if, position-if-not</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="reduce_function.html">reduce</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="remove-duplicates_delete-duplicates_function.html">remove-duplicates, delete-duplicates</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="remove_remove-if_remove-if-not_delete_delete-if_delete-if-not_function.html">remove, remove-if, remove-if-not, delete, delete-if, delete-if-not</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link menu__link--active" aria-current="page" tabindex="0" href="replace_function.html">replace</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="reverse_nreverse_function.html">reverse, nreverse</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="search_function.html">search</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="sequence_system-class.html">sequence</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="sort_stable-sort_function.html">sort, stable-sort</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="subseq_accessor.html">subseq</a></li></ul></li></ul></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../../chap-18/bi-b-hash-table-concepts.html">18. Hash Tables</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../../chap-19/bj-b-overview-of-filenames.html">19. Filenames</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../../chap-20/ca-b-file-system-concepts.html">20. Files</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../../chap-21/cb-b-stream-concepts.html">21. Streams</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../../chap-22/cc-b-the-lisp-printer.html">22. Printer</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../../chap-23/cd-b-reader-concepts.html">23. Reader</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../../chap-24/ce-b-system-construction-concepts.html">24. System Construction</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../../chap-25/cf-b-the-external-environment.html">25. External Environment</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../../environments.html">26. Environments</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../../meta-object-protocol.html">27. Meta Object Protocol</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../../data-structures.html">28. Data Structures</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../../portability/trivial-packages.html">29. Portability</a></div></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-1 menu__list-item"><a class="menu__link" href="../../dictionary-entries.html">dictionary-entries</a></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../../chap-26/intro.html">Glossary</a></div></li></ul></nav></div></div></aside><main class="docMainContainer_TBSr"><div class="container padding-top--md padding-bottom--lg"><div class="row"><div class="col docItemCol_VOVn"><div class="docItemContainer_Djhp"><article><nav class="theme-doc-breadcrumbs breadcrumbsContainer_Z_bl" aria-label="Breadcrumbs"><ul class="breadcrumbs" itemscope="" itemtype="https://schema.org/BreadcrumbList"><li class="breadcrumbs__item"><a aria-label="Home page" class="breadcrumbs__link" href="../../index.html"><svg viewBox="0 0 24 24" class="breadcrumbHomeIcon_YNFT"><path d="M10 19v-5h4v5c0 .55.45 1 1 1h3c.55 0 1-.45 1-1v-7h1.7c.46 0 .68-.57.33-.87L12.67 3.6c-.38-.34-.96-.34-1.34 0l-8.36 7.53c-.34.3-.13.87.33.87H5v7c0 .55.45 1 1 1h3c.55 0 1-.45 1-1z" fill="currentColor"></path></svg></a></li><li class="breadcrumbs__item"><span class="breadcrumbs__link">17. Sequences</span><meta itemprop="position" content="1"></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item"><a class="breadcrumbs__link" itemprop="item" href="../../category/173-sequences-dictionary.html"><span itemprop="name">17.3 Sequences Dictionary</span></a><meta itemprop="position" content="2"></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item breadcrumbs__item--active"><span class="breadcrumbs__link" itemprop="name">replace</span><meta itemprop="position" content="3"></li></ul></nav><div class="tocCollapsible_ETCw theme-doc-toc-mobile tocMobile_ITEo"><button type="button" class="clean-btn tocCollapsibleButton_TO0P">On this page</button></div><div class="theme-doc-markdown markdown"><h1>replace</h1>
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<!-- -->
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<!-- -->
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<p><strong>replace</strong> <span><i>Function</i></span></p>
|
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<p><strong>Syntax:</strong></p>
|
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<p><span><b>replace</b></span> <em>sequence-1 sequence-2</em> &key <em>start1 end1 start2 end2 → sequence-1</em></p>
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<p><strong>Arguments and Values:</strong></p>
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<p><em>sequence-1</em>—a <em>sequence</em>.</p>
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<p><em>sequence-2</em>—a <em>sequence</em>.</p>
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<p><em>start1</em>, <em>end1</em>—<span><i>bounding index designators</i></span> of <em>sequence-1</em>. The defaults for <em>start1</em> and <em>end1</em> are 0 and <span><b>nil</b></span>, respectively.</p>
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<p><em>start2</em>, <em>end2</em>—<span><i>bounding index designators</i></span> of <em>sequence-2</em>. The defaults for <em>start2</em> and <em>end2</em> are 0 and <span><b>nil</b></span>, respectively.</p>
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<p><strong>Description:</strong></p>
|
||
<p>Destructively modifies <em>sequence-1</em> by replacing the <span><i>elements</i></span> of <em>subsequence-1 bounded</em> by <em>start1</em> and <em>end1</em> with the <span><i>elements</i></span> of <em>subsequence-2 bounded</em> by <em>start2</em> and <em>end2</em>.</p>
|
||
<p><em>Sequence-1</em> is destructively modified by copying successive <span><i>elements</i></span> into it from <em>sequence-2</em>. <span><i>Elements</i></span> of the subsequence of <em>sequence-2 bounded</em> by <em>start2</em> and <em>end2</em> are copied into the subsequence of <em>sequence-1 bounded</em> by <em>start1</em> and <em>end1</em>. If these subsequences are not of the same length, then the shorter length determines how many <span><i>elements</i></span> are copied; the extra <span><i>elements</i></span> near the end of the longer subsequence are not involved in the operation. The number of elements copied can be expressed as:</p>
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<p>(min (- <em>end1 start1</em>) (- <em>end2 start2</em>))</p>
|
||
<p>If <em>sequence-1</em> and <em>sequence-2</em> are the <em>same object</em> and the region being modified overlaps the region being copied from, then it is as if the entire source region were copied to another place and only then copied back into the target region. However, if <em>sequence-1</em> and <em>sequence-2</em> are not the same, but the region being modified overlaps the region being copied from (perhaps because of shared list structure or displaced <span><i>arrays</i></span>), then after the <span><b>replace</b></span> operation the subsequence of <em>sequence-1</em> being modified will have unpredictable contents. It is an error if the elements of <em>sequence-2</em> are not of a <span><i>type</i></span> that can be stored into <em>sequence-1</em>.</p>
|
||
<p><strong>Examples:</strong></p>
|
||
<div class="language-lisp codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-lisp codeBlock_bY9V thin-scrollbar" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">replace</span><span class="token plain"> </span><span class="token string" style="color:#e3116c">"abcdefghij"</span><span class="token plain"> </span><span class="token string" style="color:#e3116c">"0123456789"</span><span class="token plain"> </span><span class="token lisp-property property" style="color:#36acaa">:start1</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">4</span><span class="token plain"> </span><span class="token lisp-property property" style="color:#36acaa">:end1</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">7</span><span class="token plain"> </span><span class="token lisp-property property" style="color:#36acaa">:start2</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">4</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">→ </span><span class="token string" style="color:#e3116c">"abcd456hij"</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token punctuation" style="color:#393A34">(</span><span class="token keyword" style="color:#00009f">setq</span><span class="token plain"> lst </span><span class="token string" style="color:#e3116c">"012345678"</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> → </span><span class="token string" style="color:#e3116c">"012345678"</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">replace</span><span class="token plain"> lst lst </span><span class="token lisp-property property" style="color:#36acaa">:start1</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">2</span><span class="token plain"> </span><span class="token lisp-property property" style="color:#36acaa">:start2</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">0</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> → </span><span class="token string" style="color:#e3116c">"010123456"</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">lst → </span><span class="token string" style="color:#e3116c">"010123456"</span><span class="token plain"> </span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div>
|
||
<p><strong>Side Effects:</strong></p>
|
||
<p>The <em>sequence-1</em> is modified.</p>
|
||
<p><strong>See Also:</strong></p>
|
||
<span><b>fill</b></span>
|
||
<b><sup>substitute, substitute-if, substitute-if-not, nsubsti</sup> tute, nsubstitute-if, nsubstitute-if-not</b>
|
||
<i>Function</i>
|
||
<p><strong>Syntax:</strong></p>
|
||
<p><strong>substitute</strong> <em>newitem olditem sequence</em> &key <em>from-end test</em></p>
|
||
<p><em>test-not start</em></p>
|
||
<p><em>end count key</em></p>
|
||
<p>→ result-sequence</p>
|
||
<p><strong>substitute-if</strong> <em>newitem predicate sequence</em> &key <em>from-end start end count key</em></p>
|
||
<p>→ result-sequence</p>
|
||
<p><strong>substitute-if-not</strong> <em>newitem predicate sequence</em> &key <em>from-end start end count key</em></p>
|
||
<p>→ result-sequence</p>
|
||
<p><strong>nsubstitute</strong> <em>newitem olditem sequence</em> &key <em>from-end test test-not start end count key → sequence</em></p>
|
||
<p><strong>substitute, substitute-if, substitute-if-not,</strong> <em>. . .</em></p>
|
||
<p><strong>nsubstitute-if</strong> <em>newitem predicate sequence</em> &key <em>from-end start end count key</em></p>
|
||
<p>→ sequence</p>
|
||
<p><strong>nsubstitute-if-not</strong> <em>newitem predicate sequence</em> &key <em>from-end start end count key</em></p>
|
||
<p>→ sequence</p>
|
||
<p><strong>Arguments and Values:</strong></p>
|
||
<p><em>newitem</em>—an <span><i>object</i></span>.</p>
|
||
<p><em>olditem</em>—an <span><i>object</i></span>.</p>
|
||
<p><em>sequence</em>—a <span><i>proper sequence</i></span>.</p>
|
||
<p><span><i>predicate</i></span>—a <span><i>designator</i></span> for a <span><i>function</i></span> of one <span><i>argument</i></span> that returns a <span><i>generalized boolean</i></span>. <em>from-end</em>—a <span><i>generalized boolean</i></span>. The default is <span><i>false</i></span>.</p>
|
||
<p><em>test</em>—a <span><i>designator</i></span> for a <span><i>function</i></span> of two <span><i>arguments</i></span> that returns a <span><i>generalized boolean</i></span>. <em>test-not<span><i>—a </i></span>designator</em> for a <span><i>function</i></span> of two <span><i>arguments</i></span> that returns a <span><i>generalized boolean</i></span>.</p>
|
||
<p><em>start</em>, <em>end</em>—<span><i>bounding index designators</i></span> of <em>sequence</em>. The defaults for <em>start</em> and <em>end</em> are 0 and <span><b>nil</b></span>, respectively.</p>
|
||
<p><em>count</em>—an <em>integer</em> or <span><b>nil</b></span>. The default is <span><b>nil</b></span>.</p>
|
||
<p><span><i>key</i></span>—a <span><i>designator</i></span> for a <span><i>function</i></span> of one argument, or <span><b>nil</b></span>.</p>
|
||
<p><em>result-sequence</em>—a <em>sequence</em>.</p>
|
||
<p><strong>Description:</strong></p>
|
||
<p><strong>substitute</strong>, <strong>substitute-if</strong>, and <strong>substitute-if-not</strong> return a copy of <em>sequence</em> in which each <span><i>element</i></span> that <em>satisfies the test</em> has been replaced with <em>newitem</em>.</p>
|
||
<p><strong>nsubstitute</strong>, <strong>nsubstitute-if</strong>, and <strong>nsubstitute-if-not</strong> are like <strong>substitute</strong>, <strong>substitute-if</strong>, and <strong>substitute-if-not</strong> respectively, but they may modify <em>sequence</em>.</p>
|
||
<p>If <em>sequence</em> is a <span><i>vector</i></span> , the result is a <span><i>vector</i></span> that has the same <span><i>actual array element type</i></span> as <em>sequence</em>. If <em>sequence</em> is a <span><i>list</i></span>, the result is a <span><i>list</i></span>.</p>
|
||
<p><em>Count</em>, if supplied, limits the number of elements altered; if more than <em>count elements satisfy the test</em>, then of these <span><i>elements</i></span> only the leftmost or rightmost, depending on <em>from-end</em>, are replaced, as many as specified by <em>count</em>. If <em>count</em> is supplied and negative, the behavior is as if zero had been supplied instead. If <em>count</em> is <span><b>nil</b></span>, all matching items are affected.</p>
|
||
<p>Supplying a <em>from-end</em> of <span><i>true</i></span> matters only when the <em>count</em> is provided (and <span><i>non-nil</i></span>); in that case, only the rightmost <em>count elements satisfying the test</em> are removed (instead of the leftmost).</p>
|
||
<p><span><i>predicate</i></span>, <em>test</em>, and <em>test-not</em> might be called more than once for each <em>sequence element</em>, and their side effects can happen in any order.</p>
|
||
<p><strong>substitute, substitute-if, substitute-if-not,</strong> <em>. . .</em></p>
|
||
<p>The result of all these functions is a <em>sequence</em> of the same <span><i>type</i></span> as <em>sequence</em> that has the same elements except that those in the subsequence <span><i>bounded</i></span> by <em>start</em> and <em>end</em> and <em>satisfying the test</em> have been replaced by <em>newitem</em>.</p>
|
||
<p><strong>substitute</strong>, <strong>substitute-if</strong>, and <strong>substitute-if-not</strong> return a <em>sequence</em> which can share with <em>sequence</em> or may be <span><i>identical</i></span> to the input <em>sequence</em> if no elements need to be changed.</p>
|
||
<p><strong>nsubstitute</strong> and <strong>nsubstitute-if</strong> are required to <span><b>setf</b></span> any <span><b>car</b></span> (if <em>sequence</em> is a <span><i>list</i></span>) or <span><b>aref</b></span> (if <em>sequence</em> is a <span><i>vector</i></span> ) of <em>sequence</em> that is required to be replaced with <em>newitem</em>. If <em>sequence</em> is a <span><i>list</i></span>, none of the <span><i>cdrs</i></span> of the top-level <span><i>list</i></span> can be modified.</p>
|
||
<p><strong>Examples:</strong></p>
|
||
<div class="language-lisp codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-lisp codeBlock_bY9V thin-scrollbar" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token punctuation" style="color:#393A34">(</span><span class="token car">substitute</span><span class="token plain"> #\. #\SPACE </span><span class="token string" style="color:#e3116c">"0 2 4 6"</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> → </span><span class="token string" style="color:#e3116c">"0.2.4.6"</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">substitute</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">9</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">4</span><span class="token plain"> ’</span><span class="token punctuation" style="color:#393A34">(</span><span class="token number" style="color:#36acaa">1</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">2</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">4</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">1</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">3</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">4</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">5</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> → </span><span class="token punctuation" style="color:#393A34">(</span><span class="token number" style="color:#36acaa">1</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">2</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">9</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">1</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">3</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">9</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">5</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">substitute</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">9</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">4</span><span class="token plain"> ’</span><span class="token punctuation" style="color:#393A34">(</span><span class="token number" style="color:#36acaa">1</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">2</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">4</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">1</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">3</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">4</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">5</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><span class="token lisp-property property" style="color:#36acaa">:count</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">1</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> → </span><span class="token punctuation" style="color:#393A34">(</span><span class="token number" style="color:#36acaa">1</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">2</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">9</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">1</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">3</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">4</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">5</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">substitute</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">9</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">4</span><span class="token plain"> ’</span><span class="token punctuation" style="color:#393A34">(</span><span class="token number" style="color:#36acaa">1</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">2</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">4</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">1</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">3</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">4</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">5</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><span class="token lisp-property property" style="color:#36acaa">:count</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">1</span><span class="token plain"> </span><span class="token lisp-property property" style="color:#36acaa">:from-end</span><span class="token plain"> </span><span class="token boolean" style="color:#36acaa">t</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">→ </span><span class="token punctuation" style="color:#393A34">(</span><span class="token number" style="color:#36acaa">1</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">2</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">4</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">1</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">3</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">9</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">5</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">substitute</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">9</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">3</span><span class="token plain"> ’</span><span class="token punctuation" style="color:#393A34">(</span><span class="token number" style="color:#36acaa">1</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">2</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">4</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">1</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">3</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">4</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">5</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><span class="token lisp-property property" style="color:#36acaa">:test</span><span class="token plain"> #’></span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> → </span><span class="token punctuation" style="color:#393A34">(</span><span class="token number" style="color:#36acaa">9</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">9</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">4</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">9</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">3</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">4</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">5</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">substitute-if</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">0</span><span class="token plain"> #’evenp ’</span><span class="token punctuation" style="color:#393A34">(</span><span class="token punctuation" style="color:#393A34">(</span><span class="token number" style="color:#36acaa">1</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token number" style="color:#36acaa">2</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token number" style="color:#36acaa">3</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token number" style="color:#36acaa">4</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><span class="token lisp-property property" style="color:#36acaa">:start</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">2</span><span class="token plain"> </span><span class="token lisp-property property" style="color:#36acaa">:key</span><span class="token plain"> #’car</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">→ </span><span class="token punctuation" style="color:#393A34">(</span><span class="token punctuation" style="color:#393A34">(</span><span class="token number" style="color:#36acaa">1</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token number" style="color:#36acaa">2</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token number" style="color:#36acaa">3</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">0</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">substitute-if</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">9</span><span class="token plain"> #’oddp ’</span><span class="token punctuation" style="color:#393A34">(</span><span class="token number" style="color:#36acaa">1</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">2</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">4</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">1</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">3</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">4</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">5</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> → </span><span class="token punctuation" style="color:#393A34">(</span><span class="token number" style="color:#36acaa">9</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">2</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">4</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">9</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">9</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">4</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">9</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">substitute-if</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">9</span><span class="token plain"> #’evenp ’</span><span class="token punctuation" style="color:#393A34">(</span><span class="token number" style="color:#36acaa">1</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">2</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">4</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">1</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">3</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">4</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">5</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><span class="token lisp-property property" style="color:#36acaa">:count</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">1</span><span class="token plain"> </span><span class="token lisp-property property" style="color:#36acaa">:from-end</span><span class="token plain"> </span><span class="token boolean" style="color:#36acaa">t</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">→ </span><span class="token punctuation" style="color:#393A34">(</span><span class="token number" style="color:#36acaa">1</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">2</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">4</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">1</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">3</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">9</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">5</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token punctuation" style="color:#393A34">(</span><span class="token keyword" style="color:#00009f">setq</span><span class="token plain"> some-things </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">list</span><span class="token plain"> ’a ’car ’b ’cdr ’c</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> → </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">A</span><span class="token plain"> CAR B CDR C</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">nsubstitute-if</span><span class="token plain"> </span><span class="token string" style="color:#e3116c">"function was here"</span><span class="token plain"> #’fboundp some-things </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token lisp-property property" style="color:#36acaa">:count</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">1</span><span class="token plain"> </span><span class="token lisp-property property" style="color:#36acaa">:from-end</span><span class="token plain"> </span><span class="token boolean" style="color:#36acaa">t</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> → </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">A</span><span class="token plain"> CAR B </span><span class="token string" style="color:#e3116c">"function was here"</span><span class="token plain"> C</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">some-things → </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">A</span><span class="token plain"> CAR B </span><span class="token string" style="color:#e3116c">"function was here"</span><span class="token plain"> C</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token punctuation" style="color:#393A34">(</span><span class="token keyword" style="color:#00009f">setq</span><span class="token plain"> alpha-tester </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">copy-seq</span><span class="token plain"> </span><span class="token string" style="color:#e3116c">"ab "</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> → </span><span class="token string" style="color:#e3116c">"ab "</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">nsubstitute-if-not</span><span class="token plain"> #\z #’alpha-char-p alpha-tester</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> → </span><span class="token string" style="color:#e3116c">"abz"</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">alpha-tester → </span><span class="token string" style="color:#e3116c">"abz"</span><span class="token plain"> </span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div>
|
||
<p><strong>Side Effects:</strong></p>
|
||
<p><strong>nsubstitute</strong>, <strong>nsubstitute-if</strong>, and <strong>nsubstitute-if-not</strong> modify <em>sequence</em>.</p>
|
||
<p><strong>Exceptional Situations:</strong></p>
|
||
<p>Should be prepared to signal an error of <span><i>type</i></span> <span><b>type-error</b></span> if <em>sequence</em> is not a <span><i>proper sequence</i></span>.</p>
|
||
<p><strong>See Also:</strong></p>
|
||
<p><span><b>subst</b></span>, <span><b>nsubst</b></span>, Section 3.2.1 (Compiler Terminology), Section 3.6 (Traversal Rules and Side Effects)</p>
|
||
<p><strong>Notes:</strong></p>
|
||
<p>If <em>sequence</em> is a <span><i>vector</i></span> , the result might or might not be simple, and might or might not be <span><i>identical</i></span></p>
|
||
<p>to <em>sequence</em>.</p>
|
||
<p>The <!-- -->:test-not<!-- --> <span><i>argument</i></span> is deprecated.</p>
|
||
<p>The functions <strong>substitute-if-not</strong> and <strong>nsubstitute-if-not</strong> are deprecated.</p>
|
||
<p><strong>nsubstitute</strong> and <strong>nsubstitute-if</strong> can be used in for-effect-only positions in code.</p>
|
||
<p>Because the side-effecting variants (<em>e.g.</em>, <strong>nsubstitute</strong>) potentially change the path that is being traversed, their effects in the presence of shared or circular structure may vary in surprising ways when compared to their non-side-effecting alternatives. To see this, consider the following side-effect behavior, which might be exhibited by some implementations:</p>
|
||
<p>(defun test-it (fn)</p>
|
||
<p>(let ((x (cons ’b nil)))</p>
|
||
<p>(rplacd x x)</p>
|
||
<p>(funcall fn ’a ’b x <!-- -->:count<!-- --> 1)))</p>
|
||
<p>(test-it #’substitute) → (A . #1=(B . #1#))</p>
|
||
<p>(test-it #’nsubstitute) → (A . #1#)</p>
|
||
<h2 class="anchor anchorWithStickyNavbar_LWe7" id="expanded-reference-replace">Expanded Reference: replace<a href="replace_function.html#expanded-reference-replace" class="hash-link" aria-label="Direct link to Expanded Reference: replace" title="Direct link to Expanded Reference: replace"></a></h2>
|
||
<div class="theme-admonition theme-admonition-tip admonition_xJq3 alert alert--success"><div class="admonitionHeading_Gvgb"><span class="admonitionIcon_Rf37"><svg viewBox="0 0 12 16"><path fill-rule="evenodd" d="M6.5 0C3.48 0 1 2.19 1 5c0 .92.55 2.25 1 3 1.34 2.25 1.78 2.78 2 4v1h5v-1c.22-1.22.66-1.75 2-4 .45-.75 1-2.08 1-3 0-2.81-2.48-5-5.5-5zm3.64 7.48c-.25.44-.47.8-.67 1.11-.86 1.41-1.25 2.06-1.45 3.23-.02.05-.02.11-.02.17H5c0-.06 0-.13-.02-.17-.2-1.17-.59-1.83-1.45-3.23-.2-.31-.42-.67-.67-1.11C2.44 6.78 2 5.65 2 5c0-2.2 2.02-4 4.5-4 1.22 0 2.36.42 3.22 1.19C10.55 2.94 11 3.94 11 5c0 .66-.44 1.78-.86 2.48zM4 14h5c-.23 1.14-1.3 2-2.5 2s-2.27-.86-2.5-2z"></path></svg></span>tip</div><div class="admonitionContent_BuS1"><p>TODO: Please contribute to this page by adding explanations and examples</p></div></div>
|
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<div class="language-lisp codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-lisp codeBlock_bY9V thin-scrollbar" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token punctuation" style="color:#393A34">(</span><span class="token car">replace</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">)</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg 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