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<title>BQN: Element Of (`∊`)</title>
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<h1 id="element-of-"><a class="header" href="#element-of-">Element Of (<code><span class='Function'>∊</span></code>)</a></h1>
<h2 id="--unique-mask"><a class="header" href="#--unique-mask"><code><span class='Function'>∊</span> <span class='Value'>𝕩</span></code>: Unique Mask</a></h2>
<p>Mark the first occurrence of each major cell in <code><span class='Value'>𝕩</span></code> with a 1, and all other occurrences with a 0.</p>
<a class="replLink" title="Open in the REPL" target="_blank" href="https://mlochbaum.github.io/BQN/try.html#code=ICAg4oiKIDTigL814oC/NuKAvzbigL804oC/N+KAvzUKCiAgIGEg4oaQIDPigL8zIOKliiDihpU5CgogICDiiIogYQ==">↗️</a><pre> <span class='Function'>∊</span> <span class='Number'>4</span><span class='Ligature'>‿</span><span class='Number'>5</span><span class='Ligature'>‿</span><span class='Number'>6</span><span class='Ligature'>‿</span><span class='Number'>6</span><span class='Ligature'>‿</span><span class='Number'>4</span><span class='Ligature'>‿</span><span class='Number'>7</span><span class='Ligature'>‿</span><span class='Number'>5</span>
⟨ 1 1 1 0 0 1 0 ⟩
<span class='Value'>a</span> <span class='Gets'>←</span> <span class='Number'>3</span><span class='Ligature'>‿</span><span class='Number'>3</span> <span class='Function'>⥊</span> <span class='Function'>↕</span><span class='Number'>9</span>
<span class='Function'>∊</span> <span class='Value'>a</span>
⟨ 1 1 1 ⟩
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<h2 id="---member-of"><a class="header" href="#---member-of"><code><span class='Value'>𝕨</span> <span class='Function'>∊</span> <span class='Value'>𝕩</span></code>: Member Of</a></h2>
<p>Is each element in <code><span class='Value'>𝕨</span></code> a major cell of <code><span class='Value'>𝕩</span></code>?</p>
<a class="replLink" title="Open in the REPL" target="_blank" href="https://mlochbaum.github.io/BQN/try.html#code=ICAg4p+oMeKfqSDiiIog4oaVOQoKICAgYSDihpAgM+KAvzMg4qWKIOKGlTkKCiAgIOKfqDDigL8x4oC/MuKfqSDiiIogYQoKICAg4p+oMeKAvzMg4qWKIDDigL8x4oC/MuKfqSDiiIogYQ==">↗️</a><pre> <span class='Bracket'>⟨</span><span class='Number'>1</span><span class='Bracket'>⟩</span> <span class='Function'>∊</span> <span class='Function'>↕</span><span class='Number'>9</span>
⟨ 1 ⟩
<span class='Value'>a</span> <span class='Gets'>←</span> <span class='Number'>3</span><span class='Ligature'>‿</span><span class='Number'>3</span> <span class='Function'>⥊</span> <span class='Function'>↕</span><span class='Number'>9</span>
<span class='Error'>Error: Redefinition</span>
<span class='Bracket'>⟨</span><span class='Number'>0</span><span class='Ligature'>‿</span><span class='Number'>1</span><span class='Ligature'>‿</span><span class='Number'>2</span><span class='Bracket'>⟩</span> <span class='Function'>∊</span> <span class='Value'>a</span>
┌·
· 0
┘
<span class='Bracket'>⟨</span><span class='Number'>1</span><span class='Ligature'>‿</span><span class='Number'>3</span> <span class='Function'>⥊</span> <span class='Number'>0</span><span class='Ligature'>‿</span><span class='Number'>1</span><span class='Ligature'>‿</span><span class='Number'>2</span><span class='Bracket'>⟩</span> <span class='Function'>∊</span> <span class='Value'>a</span>
┌·
· 0
┘
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