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<title data-rh="true">17.2 Rules about Test Functions | Common Lisp (New) Language Reference</title><meta data-rh="true" name="viewport" content="width=device-width,initial-scale=1"><meta data-rh="true" name="twitter:card" content="summary_large_image"><meta data-rh="true" property="og:image" content="https://lisp-docs.github.io/cl-language-reference/img/1024px-Lisp_logo.svg.png"><meta data-rh="true" name="twitter:image" content="https://lisp-docs.github.io/cl-language-reference/img/1024px-Lisp_logo.svg.png"><meta data-rh="true" property="og:url" content="https://lisp-docs.github.io/cl-language-reference/chap-17/bh-c-rules-about-test-functions"><meta data-rh="true" property="og:locale" content="en"><meta data-rh="true" name="docusaurus_locale" content="en"><meta data-rh="true" name="docsearch:language" content="en"><meta data-rh="true" name="google-site-verification" content="Vzaw013_bfdKeUVG89Ch3W1zC9_vH9ID2dPB9Dz0vr0"><meta data-rh="true" name="docusaurus_version" content="current"><meta data-rh="true" name="docusaurus_tag" content="docs-default-current"><meta data-rh="true" name="docsearch:version" content="current"><meta data-rh="true" name="docsearch:docusaurus_tag" content="docs-default-current"><meta data-rh="true" property="og:title" content="17.2 Rules about Test Functions | Common Lisp (New) Language Reference"><meta data-rh="true" name="description" content="17.2.1 Satisfying a Two"><meta data-rh="true" property="og:description" content="17.2.1 Satisfying a Two"><link data-rh="true" rel="icon" href="../img/favicon.ico"><link data-rh="true" rel="canonical" href="bh-c-rules-about-test-functions.html"><link data-rh="true" rel="alternate" href="bh-c-rules-about-test-functions.html" hreflang="en"><link data-rh="true" rel="alternate" href="bh-c-rules-about-test-functions.html" hreflang="x-default"><link data-rh="true" rel="preconnect" href="https://C1F2Q5VM6X-dsn.algolia.net" crossorigin="anonymous"><link rel="preconnect" href="https://www.google-analytics.com">
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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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<!-- -->
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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="colo
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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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<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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<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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