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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 menu__link--active" aria-current="page" 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 menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist" aria-expanded="false" tabindex="0" href="../category/173-sequences-dictionary.html">17.3 Sequences Dictionary</a><button aria-label="Expand sidebar category '17.3 Sequences Dictionary'" type="button" class="clean-btn menu__caret"></button></div></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 breadcrumbs__item--active"><span class="breadcrumbs__link" itemprop="name">17.2 Rules about Test Functions</span><meta itemprop="position" content="2"></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>17.2 Rules about Test Functions</h1>
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<h2 class="anchor anchorWithStickyNavbar_LWe7" id="1721-satisfying-a-two">17.2.1 Satisfying a Two<a href="bh-c-rules-about-test-functions.html#1721-satisfying-a-two" class="hash-link" aria-label="Direct link to 17.2.1 Satisfying a Two" title="Direct link to 17.2.1 Satisfying a Two"></a></h2>
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<p>When an <i>object O</i> is being considered iteratively against each <i>element E<sub>i</sub></i> of a <i>sequence S</i> by an <i>operator F</i> listed in Figure 17–2, it is sometimes useful to control the way in which the presence of <i>O</i> is tested in <i>S</i> is tested by <i>F</i>. This control is offered on the basis of a <i>function</i> designated with either a <!-- -->:test<!-- --> or <!-- -->:test-not<!-- --> <i>argument</i>.</p>
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<p>|</p><p><strong>adjoin nset-exclusive-or search</strong> </p><p><strong>assoc nsublis set-difference count nsubst set-exclusive-or delete nsubstitute sublis</strong> </p><p><strong>find nunion subsetp</strong> </p><p><strong>intersection position subst</strong> </p><p><strong>member pushnew substitute</strong> </p><p><strong>mismatch rassoc tree-equal</strong> </p><p><strong>nintersection remove union</strong> </p><p><strong>nset-difference remove-duplicates</strong></p>|<p></p>
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<p>| :- |</p>
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<p><strong>Figure 17–2. Operators that have Two-Argument Tests to be Satisfied</strong></p>
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<p>The object <i>O</i> might not be compared directly to <i>E<sub>i</sub></i>. If a <!-- -->:key<!-- --> <i>argument</i> is provided, it is a <i>designator</i> for a <i>function</i> of one <i>argument</i> to be called with each <i>E<sub>i</sub></i> as an <i>argument</i>, and <i>yielding</i> an <i>object Z<sub>i</sub></i> to be used for comparison. (If there is no <!-- -->:key<!-- --> <i>argument</i>, <i>Z<sub>i</sub></i>is <i>E<sub>i</sub></i>.)</p>
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<p>The <span><i>function</i></span> designated by the <!-- -->:key<!-- --> <span><i>argument</i></span> is never called on <em>O</em> itself. However, if the function operates on multiple sequences (<em>e.g.</em>, as happens in <span><b>set-difference</b></span>), <em>O</em> will be the result of calling the <!-- -->:key<!-- --> function on an <span><i>element</i></span> of the other sequence.</p>
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<p>A <!-- -->:test<!-- --> <i>argument</i>, if supplied to <i>F</i>, is a <i>designator</i> for a <i>function</i> of two <i>arguments</i>, <i>O</i> and <i>Z<sub>i</sub></i>. An <i>E<sub>i</sub></i>is said (or, sometimes, an <i>O</i> and an <i>E<sub>i</sub></i> are said) to <i>satisfy the test</i> if this <!-- -->:test<!-- --> <i>function</i> returns a <i>generalized boolean</i> representing <i>true</i>.</p>
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<p>A <!-- -->:test-not<!-- --> <i>argument</i>, if supplied to <i>F</i>, is <i>designator</i> for a <i>function</i> of two <i>arguments</i>, <i>O</i> and <i>Z<sub>i</sub></i>. An <i>E<sub>i</sub></i>is said (or, sometimes, an <i>O</i> and an <i>E<sub>i</sub></i> are said) to <i>satisfy the test</i> if this <!-- -->:test-not<!-- --> <i>function</i> returns a <i>generalized boolean</i> representing <i>false</i>.</p>
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<p>If neither a <!-- -->:test<!-- --> nor a <!-- -->:test-not<!-- --> <span><i>argument</i></span> is supplied, it is as if a <!-- -->:test<!-- --> argument of #’eql was supplied.</p>
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<p>The consequences are unspecified if both a <!-- -->:test<!-- --> and a <!-- -->:test-not<!-- --> <span><i>argument</i></span> are supplied in the same <span><i>call</i></span> to <em>F</em>.</p>
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<h3 class="anchor anchorWithStickyNavbar_LWe7" id="17211-examples-of-satisfying-a-two">17.2.1.1 Examples of Satisfying a Two<a href="bh-c-rules-about-test-functions.html#17211-examples-of-satisfying-a-two" class="hash-link" aria-label="Direct link to 17.2.1.1 Examples of Satisfying a Two" title="Direct link to 17.2.1.1 Examples of Satisfying a Two"></a></h3>
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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">remove</span><span class="token plain"> </span><span class="token string" style="color:#e3116c">"FOO"</span><span class="token plain"> ’</span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">foo</span><span class="token plain"> bar </span><span class="token string" style="color:#e3116c">"FOO"</span><span class="token plain"> </span><span class="token string" style="color:#e3116c">"BAR"</span><span class="token plain"> </span><span class="token string" style="color:#e3116c">"foo"</span><span class="token plain"> </span><span class="token string" style="color:#e3116c">"bar"</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"> #’equal</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">foo</span><span class="token plain"> bar </span><span class="token string" style="color:#e3116c">"BAR"</span><span class="token plain"> </span><span class="token string" style="color:#e3116c">"foo"</span><span class="token plain"> </span><span class="token string" style="color:#e3116c">"bar"</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">remove</span><span class="token plain"> </span><span class="token string" style="color:#e3116c">"FOO"</span><span class="token plain"> ’</span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">foo</span><span class="token plain"> bar </span><span class="token string" style="color:#e3116c">"FOO"</span><span class="token plain"> </span><span class="token string" style="color:#e3116c">"BAR"</span><span class="token plain"> </span><span class="token string" style="color:#e3116c">"foo"</span><span class="token plain"> </span><span class="token string" style="color:#e3116c">"bar"</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"> #’equalp</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">foo</span><span class="token plain"> bar </span><span class="token string" style="color:#e3116c">"BAR"</span><span class="token plain"> </span><span class="token string" style="color:#e3116c">"bar"</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">remove</span><span class="token plain"> </span><span class="token string" style="color:#e3116c">"FOO"</span><span class="token plain"> ’</span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">foo</span><span class="token plain"> bar </span><span class="token string" style="color:#e3116c">"FOO"</span><span class="token plain"> </span><span class="token string" style="color:#e3116c">"BAR"</span><span class="token plain"> </span><span class="token string" style="color:#e3116c">"foo"</span><span class="token plain"> </span><span class="token string" style="color:#e3116c">"bar"</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"> #’string-equal</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">bar</span><span class="token plain"> </span><span class="token string" style="color:#e3116c">"BAR"</span><span class="token plain"> </span><span class="token string" style="color:#e3116c">"bar"</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">remove</span><span class="token plain"> </span><span class="token string" style="color:#e3116c">"FOO"</span><span class="token plain"> ’</span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">foo</span><span class="token plain"> bar </span><span class="token string" style="color:#e3116c">"FOO"</span><span class="token plain"> </span><span class="token string" style="color:#e3116c">"BAR"</span><span class="token plain"> </span><span class="token string" style="color:#e3116c">"foo"</span><span class="token plain"> </span><span class="token string" style="color:#e3116c">"bar"</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"> #’string=</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">BAR</span><span class="token plain"> </span><span class="token string" style="color:#e3116c">"BAR"</span><span class="token plain"> </span><span class="token string" style="color:#e3116c">"foo"</span><span class="token plain"> </span><span class="token string" style="color:#e3116c">"bar"</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">remove</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">1</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">1.0</span><span class="token plain"> #C</span><span class="token punctuation" style="color:#393A34">(</span><span class="token number" style="color:#36acaa">1.0</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">0.0</span><span class="token punctuation" style="color:#393A34">)</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">2.0</span><span class="token plain"> #C</span><span class="token punctuation" style="color:#393A34">(</span><span class="token number" style="color:#36acaa">2.0</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">0.0</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">:test-not</span><span class="token plain"> #’eql</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 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">remove</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">1</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">1.0</span><span class="token plain"> #C</span><span class="token punctuation" style="color:#393A34">(</span><span class="token number" style="color:#36acaa">1.0</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">0.0</span><span class="token punctuation" style="color:#393A34">)</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">2.0</span><span class="token plain"> #C</span><span class="token punctuation" style="color:#393A34">(</span><span class="token number" style="color:#36acaa">2.0</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">0.0</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">:test-not</span><span class="token plain"> #’=</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">1.0</span><span class="token plain"> #C</span><span class="token punctuation" style="color:#393A34">(</span><span class="token number" style="color:#36acaa">1.0</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">0.0</span><span class="token punctuation" style="color:#393A34">)</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">remove</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">1</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">1.0</span><span class="token plain"> #C</span><span class="token punctuation" style="color:#393A34">(</span><span class="token number" style="color:#36acaa">1.0</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">0.0</span><span class="token punctuation" style="color:#393A34">)</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">2.0</span><span class="token plain"> #C</span><span class="token punctuation" style="color:#393A34">(</span><span class="token number" style="color:#36acaa">2.0</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">0.0</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">:test</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">complement</span><span class="token plain"> #’=</span><span class="token punctuation" style="color:#393A34">)</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">1.0</span><span class="token plain"> #C</span><span class="token punctuation" style="color:#393A34">(</span><span class="token number" style="color:#36acaa">1.0</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">0.0</span><span class="token punctuation" style="color:#393A34">)</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">count</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">1</span><span class="token plain"> ’</span><span class="token punctuation" style="color:#393A34">(</span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">one</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 car">uno</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 car">two</span><span class="token plain"> </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 car">dos</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">2</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">:key</span><span class="token plain"> #’cadr</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> → </span><span class="token number" style="color:#36acaa">2</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">count</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">2.0</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">3</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"> #’eql </span><span class="token lisp-property property" style="color:#36acaa">:key</span><span class="token plain"> #’float</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> → </span><span class="token number" style="color:#36acaa">1</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">count</span><span class="token plain"> </span><span class="token string" style="color:#e3116c">"FOO"</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">list</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">make-pathname</span><span class="token plain"> </span><span class="token lisp-property property" style="color:#36acaa">:name</span><span class="token plain"> </span><span class="token string" style="color:#e3116c">"FOO"</span><span class="token plain"> </span><span class="token lisp-property property" style="color:#36acaa">:type</span><span class="token plain"> </span><span class="token string" style="color:#e3116c">"X"</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">make-pathname</span><span class="token plain"> </span><span class="token lisp-property property" style="color:#36acaa">:name</span><span class="token plain"> </span><span class="token string" style="color:#e3116c">"FOO"</span><span class="token plain"> </span><span class="token lisp-property property" style="color:#36acaa">:type</span><span class="token plain"> </span><span class="token string" style="color:#e3116c">"Y"</span><span class="token punctuation" style="color:#393A34">)</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 lisp-property property" style="color:#36acaa">:key</span><span class="token plain"> #’pathname-name </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token lisp-property property" style="color:#36acaa">:test</span><span class="token plain"> #’equal</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 number" style="color:#36acaa">2</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>
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<h2 class="anchor anchorWithStickyNavbar_LWe7" id="1722-satisfying-a-one">17.2.2 Satisfying a One<a href="bh-c-rules-about-test-functions.html#1722-satisfying-a-one" class="hash-link" aria-label="Direct link to 17.2.2 Satisfying a One" title="Direct link to 17.2.2 Satisfying a One"></a></h2>
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<!-- -->
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<p>When using one of the <span><i>functions</i></span> in Figure 17–3, the elements <em>E</em> of a <em>sequence S</em> are filtered not on the basis of the presence or absence of an object <em>O</em> under a two <em>argument predicate</em>, as with the <span><i>functions</i></span> described in Section 17.2.1 (Satisfying a Two-Argument Test), but rather on the basis of a one <em>argument predicate</em>.</p>
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<p>|</p><p><strong>assoc-if member-if rassoc-if</strong> </p><p><strong>assoc-if-not member-if-not rassoc-if-not</strong> </p><p><strong>count-if nsubst-if remove-if</strong> </p><p><strong>count-if-not nsubst-if-not remove-if-not</strong> </p><p><strong>delete-if nsubstitute-if subst-if</strong> </p><p><strong>delete-if-not nsubstitute-if-not subst-if-not</strong> </p><p><strong>find-if position-if substitute-if</strong> </p><p><strong>find-if-not position-if-not substitute-if-not</strong></p>|<p></p>
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<p>| :- |</p>
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<p><strong>Figure 17–3. Operators that have One-Argument Tests to be Satisfied</strong></p>
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<p>The element <i>E<sub>i</sub></i> might not be considered directly. If a <!-- -->:key<!-- --> <i>argument</i> is provided, it is a <i>designator</i> for a <i>function</i> of one <i>argument</i> to be called with each <i>E<sub>i</sub></i> as an <i>argument</i>, and <i>yielding</i> an <i>object Z<sub>i</sub></i> to be used for comparison. (If there is no <!-- -->:key<!-- --> <i>argument</i>, <i>Z<sub>i</sub></i>is <i>E<sub>i</sub></i>.)</p>
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<p><i>Functions</i> defined in this specification and having a name that ends in “-if” accept a first <i>argument</i> that is a <i>designator</i> for a <i>function</i> of one <i>argument</i>, <i>Z<sub>i</sub></i>. An <i>E<sub>i</sub></i>is said to <i>satisfy the test</i> if this <!-- -->:test<!-- --> <i>function</i> returns a <i>generalized boolean</i> representing <i>true</i>.</p>
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<p><i>Functions</i> defined in this specification and having a name that ends in “-if-not” accept a first <i>argument</i> that is a <i>designator</i> for a <i>function</i> of one <i>argument</i>, <i>Z<sub>i</sub></i>. An <i>E<sub>i</sub></i>is said to <i>satisfy the test</i> if this <!-- -->:test<!-- --> <i>function</i> returns a <i>generalized boolean</i> representing <i>false</i>.</p>
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<h3 class="anchor anchorWithStickyNavbar_LWe7" id="17221-examples-of-satisfying-a-one">17.2.2.1 Examples of Satisfying a One<a href="bh-c-rules-about-test-functions.html#17221-examples-of-satisfying-a-one" class="hash-link" aria-label="Direct link to 17.2.2.1 Examples of Satisfying a One" title="Direct link to 17.2.2.1 Examples of Satisfying a One"></a></h3>
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<!-- -->
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<!-- -->
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<p>(count-if #’zerop ’(1 #C(0.0 0.0) 0 0.0d0 0.0s0 3)) → 4</p>
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<p>(remove-if-not #’symbolp ’(0 1 2 3 4 5 6 7 8 9 A B C D E F))</p>
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<p>→ (A B C D E F)</p>
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<p>(remove-if (complement #’symbolp) ’(0 1 2 3 4 5 6 7 8 9 A B C D E F))</p>
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<p>→ (A B C D E F)</p>
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<p>(count-if #’zerop ’("foo" "" "bar" "" "" "baz" "quux") <!-- -->:key<!-- --> #’length)</p>
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<p>→ 3</p></div><footer class="theme-doc-footer docusaurus-mt-lg"><div class="theme-doc-footer-edit-meta-row row"><div class="col"><a href="https://github.com/lisp-docs/cl-language-reference/tree/main/docs/chap-17/bh-c-rules-about-test-functions.md" target="_blank" rel="noopener noreferrer" class="theme-edit-this-page"><svg fill="currentColor" height="20" width="20" viewBox="0 0 40 40" class="iconEdit_Z9Sw" aria-hidden="true"><g><path d="m34.5 11.7l-3 3.1-6.3-6.3 3.1-3q0.5-0.5 1.2-0.5t1.1 0.5l3.9 3.9q0.5 0.4 0.5 1.1t-0.5 1.2z m-29.5 17.1l18.4-18.5 6.3 6.3-18.4 18.4h-6.3v-6.2z"></path></g></svg>Edit this page</a></div><div class="col lastUpdated_vwxv"><span class="theme-last-updated">Last updated<!-- --> by <b>daninus14</b></span></div></div></footer></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="Docs pages"><a class="pagination-nav__link pagination-nav__link--prev" href="bh-b-sequence-concepts.html"><div class="pagination-nav__sublabel">Previous</div><div 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