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<title>BQN: Mathematical Double-struck S (𝕊)</title>
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<h1 id="mathematical-double-struck-s-"><a class="header" href="#mathematical-double-struck-s-">Mathematical Double-struck S (<code><span class='Function'>𝕊</span></code>)</a></h1>
<h2 id="-current-function"><a class="header" href="#-current-function"><code><span class='Function'>𝕊</span></code>: Current Function</a></h2>
<p>A variable assigned to the current function block. <code><span class='Value'>𝕤</span></code> can be used to access the current function block as a subject.</p>
<p><code><span class='Function'>𝕊</span></code> can be used for recursion.</p>
<a class="replLink" title="Open in the REPL" target="_blank" href="https://mlochbaum.github.io/BQN/try.html#code=RiDihpAge/CdlYogMDogMTsg8J2VqSDDlyDwnZWKIPCdlaktMX0gIyBGYWN0b3JpYWwKRiA1Cgp78J2VpOKAv/CdlaR9NA==">↗️</a><pre> <span class='Function'>F</span> <span class='Gets'>←</span> <span class='Brace'>{</span><span class='Function'>𝕊</span> <span class='Number'>0</span><span class='Value'>:</span> <span class='Number'>1</span><span class='Value'>;</span> <span class='Value'>𝕩</span> <span class='Function'>×</span> <span class='Function'>𝕊</span> <span class='Value'>𝕩</span><span class='Function'>-</span><span class='Number'>1</span><span class='Brace'>}</span> <span class='Comment'># Factorial
</span> <span class='Function'>F</span> <span class='Number'>5</span>
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<span class='Brace'>{</span><span class='Value'>𝕤</span><span class='Ligature'>‿</span><span class='Value'>𝕤</span><span class='Brace'>}</span><span class='Number'>4</span>
⟨ (function block) (function block) ⟩
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