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<title>Fonts for BQN</title>
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<div class="nav"><a href="https://github.com/mlochbaum/BQN">BQN</a> / <a href="index.html">main</a></div>
<h1>Fonts for BQN</h1>
<p>This page shows samples, and a font-selectable REPL at the end, for all four free fonts I know of that fully support BQN's character set:</p>
<ul>
<li><a href="https://github.com/mlochbaum/BQN/blob/master/docs/DejaVuBQNSansMono.ttf">DejaVu Sans Mono BQN</a>, which I adapted from DejaVu Sans Mono</li>
<li><a href="https://github.com/dzaima/BQN386">BQN386</a>, derived from APL385 by way of APL386</li>
<li><a href="http://www.kreativekorp.com/software/fonts/fairfaxhd.shtml">Fairfax HD</a></li>
<li><a href="https://github.com/cormullion/juliamono">Julia Mono</a></li>
</ul>
<p>Other than DejaVu, the versions embedded on this page are small subsets, and you should get your copy from the links above (unless perhaps you want to use them for embedding as well). In addition to these, <a href="https://www.fsd.it/shop/fonts/pragmatapro/">Pragmata Pro</a> and <a href="https://www.evertype.com/emono/">Everson Mono</a> have full support, but each charges a significant fee for usage and I can't freely embed them here.</p>
<p style="margin-top:4em">The table below shows samples of the whole BQN keyboard (which includes the entire BQN character set plus a few unused characters) and APL characters that don't feature in BQN.</p>
<table>
<tr>
<td>
DejaVu Sans Mono BQN
<pre class="DejaVu"><span class='Modifier'>`</span><span class='Number'>1234567890</span><span class='Function'>=</span> ~<span class='Function'>!</span><span class='String'>@</span><span class='Comment'>#</span>$%^&*<span class='Paren'>()</span><span class='Modifier2'>_</span><span class='Function'>+</span>
<span class='Value'>qwertyuiop</span>[] <span class='Function'>QWERTYUIOP</span><span class='Brace'>{}</span>
<span class='Value'>asdfghjkl;</span><span class='String'>'</span>\ <span class='Function'>ASDFGHJKL</span><span class='Value'>:</span><span class='String'>"</span><span class='Function'>|</span>
<span class='Value'>zxcvbnm</span><span class='Separator'>,</span><span class='Number'>.</span><span class='Function'>/</span> <span class='Function'>ZXCVBNM<></span><span class='Value'>?</span>
<span class='Modifier'>˜˘¨⁼⌜´˝</span> <span class='Number'>∞¯</span><span class='Value'>•</span><span class='Function'>×</span> <span class='Function'>¬</span><span class='Modifier2'>⎉⚇⍟◶⊘⎊</span>⍎⍕<span class='Bracket'>⟨⟩</span><span class='Function'>√⋆</span>
<span class='Function'>⌽</span><span class='Value'>𝕨</span><span class='Function'>∊↑∧</span> <span class='Function'>⊔⊏⊐</span><span class='Number'>π</span><span class='Gets'>←→</span> ↙<span class='Function'>𝕎⍷</span><span class='Value'>𝕣</span><span class='Function'>⍋</span> <span class='Function'>⊑⊒</span>⍳<span class='Function'>⊣⊢</span>
<span class='Function'>⍉</span><span class='Value'>𝕤</span><span class='Function'>↕</span><span class='Value'>𝕗𝕘</span><span class='Modifier2'>⊸∘○⟜</span><span class='Separator'>⋄</span><span class='Gets'>↩</span> ↖<span class='Function'>𝕊</span> <span class='Function'>𝔽𝔾«</span> <span class='Modifier2'>⌾</span><span class='Function'>»</span><span class='Nothing'>·</span><span class='Modifier'>˙</span>
<span class='Function'>⥊</span><span class='Value'>𝕩</span><span class='Function'>↓∨⌊</span> <span class='Function'>≡∾≍≠</span> <span class='Ligature'>‿</span> <span class='Function'>𝕏</span> <span class='Function'>⍒⌈</span> <span class='Function'>≢≤≥</span><span class='Gets'>⇐</span>
⍬⍺⍵⍴⍳⍸⌷⍨⍤⍥⍣⊖⊂⊃⊆⊇∩∪⊥⊤⍝⍀⌿⍪
⎕⌺⌹⌸⍞⍠⌶⍱⍲⍫∇∆⍢⍙…
</pre>
</td>
<td>
<div class="right">BQN386</div>
<pre class="BQN386"><span class='Modifier'>`</span><span class='Number'>1234567890</span><span class='Function'>=</span> ~<span class='Function'>!</span><span class='String'>@</span><span class='Comment'>#</span>$%^&*<span class='Paren'>()</span><span class='Modifier2'>_</span><span class='Function'>+</span>
<span class='Value'>qwertyuiop</span>[] <span class='Function'>QWERTYUIOP</span><span class='Brace'>{}</span>
<span class='Value'>asdfghjkl;</span><span class='String'>'</span>\ <span class='Function'>ASDFGHJKL</span><span class='Value'>:</span><span class='String'>"</span><span class='Function'>|</span>
<span class='Value'>zxcvbnm</span><span class='Separator'>,</span><span class='Number'>.</span><span class='Function'>/</span> <span class='Function'>ZXCVBNM<></span><span class='Value'>?</span>
<span class='Modifier'>˜˘¨⁼⌜´˝</span> <span class='Number'>∞¯</span><span class='Value'>•</span><span class='Function'>×</span> <span class='Function'>¬</span><span class='Modifier2'>⎉⚇⍟◶⊘⎊</span>⍎⍕<span class='Bracket'>⟨⟩</span><span class='Function'>√⋆</span>
<span class='Function'>⌽</span><span class='Value'>𝕨</span><span class='Function'>∊↑∧</span> <span class='Function'>⊔⊏⊐</span><span class='Number'>π</span><span class='Gets'>←→</span> ↙<span class='Function'>𝕎⍷</span><span class='Value'>𝕣</span><span class='Function'>⍋</span> <span class='Function'>⊑⊒</span>⍳<span class='Function'>⊣⊢</span>
<span class='Function'>⍉</span><span class='Value'>𝕤</span><span class='Function'>↕</span><span class='Value'>𝕗𝕘</span><span class='Modifier2'>⊸∘○⟜</span><span class='Separator'>⋄</span><span class='Gets'>↩</span> ↖<span class='Function'>𝕊</span> <span class='Function'>𝔽𝔾«</span> <span class='Modifier2'>⌾</span><span class='Function'>»</span><span class='Nothing'>·</span><span class='Modifier'>˙</span>
<span class='Function'>⥊</span><span class='Value'>𝕩</span><span class='Function'>↓∨⌊</span> <span class='Function'>≡∾≍≠</span> <span class='Ligature'>‿</span> <span class='Function'>𝕏</span> <span class='Function'>⍒⌈</span> <span class='Function'>≢≤≥</span><span class='Gets'>⇐</span>
⍬⍺⍵⍴⍳⍸⌷⍨⍤⍥⍣⊖⊂⊃⊆⊇∩∪⊥⊤⍝⍀⌿⍪
⎕⌺⌹⌸⍞⍠⌶⍱⍲⍫∇∆⍢⍙…
</pre>
</td>
</tr>
<tr>
<td>
<pre class="Fairfax"><span class='Modifier'>`</span><span class='Number'>1234567890</span><span class='Function'>=</span> ~<span class='Function'>!</span><span class='String'>@</span><span class='Comment'>#</span>$%^&*<span class='Paren'>()</span><span class='Modifier2'>_</span><span class='Function'>+</span>
<span class='Value'>qwertyuiop</span>[] <span class='Function'>QWERTYUIOP</span><span class='Brace'>{}</span>
<span class='Value'>asdfghjkl;</span><span class='String'>'</span>\ <span class='Function'>ASDFGHJKL</span><span class='Value'>:</span><span class='String'>"</span><span class='Function'>|</span>
<span class='Value'>zxcvbnm</span><span class='Separator'>,</span><span class='Number'>.</span><span class='Function'>/</span> <span class='Function'>ZXCVBNM<></span><span class='Value'>?</span>
<span class='Modifier'>˜˘¨⁼⌜´˝</span> <span class='Number'>∞¯</span><span class='Value'>•</span><span class='Function'>×</span> <span class='Function'>¬</span><span class='Modifier2'>⎉⚇⍟◶⊘⎊</span>⍎⍕<span class='Bracket'>⟨⟩</span><span class='Function'>√⋆</span>
<span class='Function'>⌽</span><span class='Value'>𝕨</span><span class='Function'>∊↑∧</span> <span class='Function'>⊔⊏⊐</span><span class='Number'>π</span><span class='Gets'>←→</span> ↙<span class='Function'>𝕎⍷</span><span class='Value'>𝕣</span><span class='Function'>⍋</span> <span class='Function'>⊑⊒</span>⍳<span class='Function'>⊣⊢</span>
<span class='Function'>⍉</span><span class='Value'>𝕤</span><span class='Function'>↕</span><span class='Value'>𝕗𝕘</span><span class='Modifier2'>⊸∘○⟜</span><span class='Separator'>⋄</span><span class='Gets'>↩</span> ↖<span class='Function'>𝕊</span> <span class='Function'>𝔽𝔾«</span> <span class='Modifier2'>⌾</span><span class='Function'>»</span><span class='Nothing'>·</span><span class='Modifier'>˙</span>
<span class='Function'>⥊</span><span class='Value'>𝕩</span><span class='Function'>↓∨⌊</span> <span class='Function'>≡∾≍≠</span> <span class='Ligature'>‿</span> <span class='Function'>𝕏</span> <span class='Function'>⍒⌈</span> <span class='Function'>≢≤≥</span><span class='Gets'>⇐</span>
⍬⍺⍵⍴⍳⍸⌷⍨⍤⍥⍣⊖⊂⊃⊆⊇∩∪⊥⊤⍝⍀⌿⍪
⎕⌺⌹⌸⍞⍠⌶⍱⍲⍫∇∆⍢⍙…
</pre>
Fairfax HD
</td>
<td>
<pre class="Julia"><span class='Modifier'>`</span><span class='Number'>1234567890</span><span class='Function'>=</span> ~<span class='Function'>!</span><span class='String'>@</span><span class='Comment'>#</span>$%^&*<span class='Paren'>()</span><span class='Modifier2'>_</span><span class='Function'>+</span>
<span class='Value'>qwertyuiop</span>[] <span class='Function'>QWERTYUIOP</span><span class='Brace'>{}</span>
<span class='Value'>asdfghjkl;</span><span class='String'>'</span>\ <span class='Function'>ASDFGHJKL</span><span class='Value'>:</span><span class='String'>"</span><span class='Function'>|</span>
<span class='Value'>zxcvbnm</span><span class='Separator'>,</span><span class='Number'>.</span><span class='Function'>/</span> <span class='Function'>ZXCVBNM<></span><span class='Value'>?</span>
<span class='Modifier'>˜˘¨⁼⌜´˝</span> <span class='Number'>∞¯</span><span class='Value'>•</span><span class='Function'>×</span> <span class='Function'>¬</span><span class='Modifier2'>⎉⚇⍟◶⊘⎊</span>⍎⍕<span class='Bracket'>⟨⟩</span><span class='Function'>√⋆</span>
<span class='Function'>⌽</span><span class='Value'>𝕨</span><span class='Function'>∊↑∧</span> <span class='Function'>⊔⊏⊐</span><span class='Number'>π</span><span class='Gets'>←→</span> ↙<span class='Function'>𝕎⍷</span><span class='Value'>𝕣</span><span class='Function'>⍋</span> <span class='Function'>⊑⊒</span>⍳<span class='Function'>⊣⊢</span>
<span class='Function'>⍉</span><span class='Value'>𝕤</span><span class='Function'>↕</span><span class='Value'>𝕗𝕘</span><span class='Modifier2'>⊸∘○⟜</span><span class='Separator'>⋄</span><span class='Gets'>↩</span> ↖<span class='Function'>𝕊</span> <span class='Function'>𝔽𝔾«</span> <span class='Modifier2'>⌾</span><span class='Function'>»</span><span class='Nothing'>·</span><span class='Modifier'>˙</span>
<span class='Function'>⥊</span><span class='Value'>𝕩</span><span class='Function'>↓∨⌊</span> <span class='Function'>≡∾≍≠</span> <span class='Ligature'>‿</span> <span class='Function'>𝕏</span> <span class='Function'>⍒⌈</span> <span class='Function'>≢≤≥</span><span class='Gets'>⇐</span>
⍬⍺⍵⍴⍳⍸⌷⍨⍤⍥⍣⊖⊂⊃⊆⊇∩∪⊥⊤⍝⍀⌿⍪
⎕⌺⌹⌸⍞⍠⌶⍱⍲⍫∇∆⍢⍙…
</pre>
<div class="right">Julia Mono</div>
</td>
</tr>
</table>
<p style="margin-top:4em">And here are code samples taken from this repository.</p>
<pre class="DejaVu"><span class='Value ul'>DejaVu Sans Mono BQN</span>
<span class='Value'>c</span><span class='Gets'>←</span><span class='Value'>𝕩</span><span class='Function'>=</span><span class='String'>'#'</span><span class='Separator'>⋄</span><span class='Value'>s</span><span class='Gets'>←</span><span class='Function'>/</span><span class='Number'>0</span><span class='Ligature'>‿</span><span class='Number'>0</span><span class='Modifier2'>⊸</span><span class='Function'>«</span><span class='Modifier2'>⊸</span><span class='Function'>∧</span><span class='Value'>sm</span><span class='Gets'>←</span><span class='Value'>𝕩</span><span class='Function'>=</span><span class='String'>'''</span><span class='Separator'>⋄</span><span class='Value'>d</span><span class='Gets'>←</span><span class='Function'>/</span><span class='Value'>dm</span><span class='Gets'>←</span><span class='Value'>𝕩</span><span class='Function'>=</span><span class='String'>'"'</span>
<span class='Value'>g</span><span class='Gets'>←</span><span class='Function'>⍋</span><span class='Value'>q</span><span class='Gets'>←</span><span class='Function'>∾</span><span class='Bracket'>⟨</span> <span class='Value'>s</span><span class='Separator'>⋄</span><span class='Number'>¯1</span><span class='Function'>↓</span><span class='Value'>d</span><span class='Separator'>⋄</span><span class='Function'>/</span><span class='Value'>c</span><span class='Bracket'>⟩</span> <span class='Separator'>⋄</span><span class='Value'>q</span><span class='Gets'>↩</span><span class='Value'>g</span><span class='Function'>⊏</span><span class='Value'>q</span> <span class='Comment'># Open indices
</span> <span class='Value'>e</span><span class='Gets'>←</span> <span class='Value'>g</span><span class='Function'>⊏∾</span><span class='Bracket'>⟨</span><span class='Number'>2</span><span class='Function'>+</span><span class='Value'>s</span><span class='Separator'>⋄</span> <span class='Number'>1</span><span class='Function'>↓</span><span class='Value'>d</span><span class='Separator'>⋄</span><span class='Function'>-</span><span class='Modifier2'>⟜</span><span class='Function'>»</span><span class='Modifier2'>∘</span><span class='Function'>⊏</span><span class='Modifier2'>⟜</span><span class='Paren'>(</span><span class='Number'>0</span><span class='Function'>∾+</span><span class='Modifier'>`</span><span class='Value'>c</span><span class='Paren'>)</span><span class='Modifier2'>⊸</span><span class='Function'>//</span><span class='Paren'>(</span><span class='Value'>𝕩</span><span class='Function'>=</span><span class='Value'>lf</span><span class='Paren'>)</span><span class='Function'>∾</span><span class='Number'>1</span><span class='Bracket'>⟩</span> <span class='Comment'># Matching close indices
</span> <span class='Function'>Se</span><span class='Gets'>←</span><span class='Brace'>{</span><span class='Paren'>(</span><span class='Function'>⊏</span><span class='Modifier'>˜</span><span class='Value'>𝕨</span><span class='Paren'>)</span><span class='Function'>Se</span> <span class='Number'>1</span><span class='Modifier'>¨</span><span class='Modifier2'>⌾</span><span class='Paren'>((</span><span class='Value'>𝕩</span><span class='Function'>/</span><span class='Value'>𝕨</span><span class='Paren'>)</span><span class='Modifier2'>⊸</span><span class='Function'>⊏</span><span class='Paren'>)</span><span class='Value'>𝕩</span><span class='Brace'>}</span><span class='Modifier2'>⍟</span><span class='Paren'>(</span><span class='Number'>0</span><span class='Function'>=</span><span class='Number'>¯1</span><span class='Function'>⊑⊢</span><span class='Paren'>)</span> <span class='Comment'># Mark reachable openings
</span>
<span class='Function'>PrecedesGroup</span> <span class='Gets'>←</span> <span class='Brace'>{</span>
<span class='Comment'># We prepend a 0 to 𝕨, so that 0 is the "before start" index, with a
</span> <span class='Comment'># false value, and normal indices are increased by 1.
</span> <span class='Value'>𝕨</span> <span class='Function'>∾</span><span class='Modifier'>˜</span><span class='Gets'>↩</span> <span class='Number'>0</span>
<span class='Value'>inds</span> <span class='Gets'>←</span> <span class='Number'>1</span> <span class='Function'>+</span> <span class='Function'>↕≠</span><span class='Value'>𝕩</span>
<span class='Comment'># Zero out indices where 𝕩 was true, and find the greatest index so
</span> <span class='Comment'># far at each position.
</span> <span class='Value'>last</span> <span class='Gets'>←</span> <span class='Function'>⌈</span><span class='Modifier'>`</span> <span class='Value'>inds</span> <span class='Function'>×</span> <span class='Function'>¬</span><span class='Value'>𝕩</span>
<span class='Value'>last</span> <span class='Function'>⊏</span> <span class='Value'>𝕨</span>
<span class='Brace'>}</span>
</pre>
<pre class="BQN386"><span class='Value ul'>BQN386</span>
<span class='Value'>c</span><span class='Gets'>←</span><span class='Value'>𝕩</span><span class='Function'>=</span><span class='String'>'#'</span><span class='Separator'>⋄</span><span class='Value'>s</span><span class='Gets'>←</span><span class='Function'>/</span><span class='Number'>0</span><span class='Ligature'>‿</span><span class='Number'>0</span><span class='Modifier2'>⊸</span><span class='Function'>«</span><span class='Modifier2'>⊸</span><span class='Function'>∧</span><span class='Value'>sm</span><span class='Gets'>←</span><span class='Value'>𝕩</span><span class='Function'>=</span><span class='String'>'''</span><span class='Separator'>⋄</span><span class='Value'>d</span><span class='Gets'>←</span><span class='Function'>/</span><span class='Value'>dm</span><span class='Gets'>←</span><span class='Value'>𝕩</span><span class='Function'>=</span><span class='String'>'"'</span>
<span class='Value'>g</span><span class='Gets'>←</span><span class='Function'>⍋</span><span class='Value'>q</span><span class='Gets'>←</span><span class='Function'>∾</span><span class='Bracket'>⟨</span> <span class='Value'>s</span><span class='Separator'>⋄</span><span class='Number'>¯1</span><span class='Function'>↓</span><span class='Value'>d</span><span class='Separator'>⋄</span><span class='Function'>/</span><span class='Value'>c</span><span class='Bracket'>⟩</span> <span class='Separator'>⋄</span><span class='Value'>q</span><span class='Gets'>↩</span><span class='Value'>g</span><span class='Function'>⊏</span><span class='Value'>q</span> <span class='Comment'># Open indices
</span> <span class='Value'>e</span><span class='Gets'>←</span> <span class='Value'>g</span><span class='Function'>⊏∾</span><span class='Bracket'>⟨</span><span class='Number'>2</span><span class='Function'>+</span><span class='Value'>s</span><span class='Separator'>⋄</span> <span class='Number'>1</span><span class='Function'>↓</span><span class='Value'>d</span><span class='Separator'>⋄</span><span class='Function'>-</span><span class='Modifier2'>⟜</span><span class='Function'>»</span><span class='Modifier2'>∘</span><span class='Function'>⊏</span><span class='Modifier2'>⟜</span><span class='Paren'>(</span><span class='Number'>0</span><span class='Function'>∾+</span><span class='Modifier'>`</span><span class='Value'>c</span><span class='Paren'>)</span><span class='Modifier2'>⊸</span><span class='Function'>//</span><span class='Paren'>(</span><span class='Value'>𝕩</span><span class='Function'>=</span><span class='Value'>lf</span><span class='Paren'>)</span><span class='Function'>∾</span><span class='Number'>1</span><span class='Bracket'>⟩</span> <span class='Comment'># Matching close indices
</span> <span class='Function'>Se</span><span class='Gets'>←</span><span class='Brace'>{</span><span class='Paren'>(</span><span class='Function'>⊏</span><span class='Modifier'>˜</span><span class='Value'>𝕨</span><span class='Paren'>)</span><span class='Function'>Se</span> <span class='Number'>1</span><span class='Modifier'>¨</span><span class='Modifier2'>⌾</span><span class='Paren'>((</span><span class='Value'>𝕩</span><span class='Function'>/</span><span class='Value'>𝕨</span><span class='Paren'>)</span><span class='Modifier2'>⊸</span><span class='Function'>⊏</span><span class='Paren'>)</span><span class='Value'>𝕩</span><span class='Brace'>}</span><span class='Modifier2'>⍟</span><span class='Paren'>(</span><span class='Number'>0</span><span class='Function'>=</span><span class='Number'>¯1</span><span class='Function'>⊑⊢</span><span class='Paren'>)</span> <span class='Comment'># Mark reachable openings
</span>
<span class='Function'>PrecedesGroup</span> <span class='Gets'>←</span> <span class='Brace'>{</span>
<span class='Comment'># We prepend a 0 to 𝕨, so that 0 is the "before start" index, with a
</span> <span class='Comment'># false value, and normal indices are increased by 1.
</span> <span class='Value'>𝕨</span> <span class='Function'>∾</span><span class='Modifier'>˜</span><span class='Gets'>↩</span> <span class='Number'>0</span>
<span class='Value'>inds</span> <span class='Gets'>←</span> <span class='Number'>1</span> <span class='Function'>+</span> <span class='Function'>↕≠</span><span class='Value'>𝕩</span>
<span class='Comment'># Zero out indices where 𝕩 was true, and find the greatest index so
</span> <span class='Comment'># far at each position.
</span> <span class='Value'>last</span> <span class='Gets'>←</span> <span class='Function'>⌈</span><span class='Modifier'>`</span> <span class='Value'>inds</span> <span class='Function'>×</span> <span class='Function'>¬</span><span class='Value'>𝕩</span>
<span class='Value'>last</span> <span class='Function'>⊏</span> <span class='Value'>𝕨</span>
<span class='Brace'>}</span>
</pre>
<pre class="Fairfax"><span class='Value ul'>Fairfax HD</span>
<span class='Value'>c</span><span class='Gets'>←</span><span class='Value'>𝕩</span><span class='Function'>=</span><span class='String'>'#'</span><span class='Separator'>⋄</span><span class='Value'>s</span><span class='Gets'>←</span><span class='Function'>/</span><span class='Number'>0</span><span class='Ligature'>‿</span><span class='Number'>0</span><span class='Modifier2'>⊸</span><span class='Function'>«</span><span class='Modifier2'>⊸</span><span class='Function'>∧</span><span class='Value'>sm</span><span class='Gets'>←</span><span class='Value'>𝕩</span><span class='Function'>=</span><span class='String'>'''</span><span class='Separator'>⋄</span><span class='Value'>d</span><span class='Gets'>←</span><span class='Function'>/</span><span class='Value'>dm</span><span class='Gets'>←</span><span class='Value'>𝕩</span><span class='Function'>=</span><span class='String'>'"'</span>
<span class='Value'>g</span><span class='Gets'>←</span><span class='Function'>⍋</span><span class='Value'>q</span><span class='Gets'>←</span><span class='Function'>∾</span><span class='Bracket'>⟨</span> <span class='Value'>s</span><span class='Separator'>⋄</span><span class='Number'>¯1</span><span class='Function'>↓</span><span class='Value'>d</span><span class='Separator'>⋄</span><span class='Function'>/</span><span class='Value'>c</span><span class='Bracket'>⟩</span> <span class='Separator'>⋄</span><span class='Value'>q</span><span class='Gets'>↩</span><span class='Value'>g</span><span class='Function'>⊏</span><span class='Value'>q</span> <span class='Comment'># Open indices
</span> <span class='Value'>e</span><span class='Gets'>←</span> <span class='Value'>g</span><span class='Function'>⊏∾</span><span class='Bracket'>⟨</span><span class='Number'>2</span><span class='Function'>+</span><span class='Value'>s</span><span class='Separator'>⋄</span> <span class='Number'>1</span><span class='Function'>↓</span><span class='Value'>d</span><span class='Separator'>⋄</span><span class='Function'>-</span><span class='Modifier2'>⟜</span><span class='Function'>»</span><span class='Modifier2'>∘</span><span class='Function'>⊏</span><span class='Modifier2'>⟜</span><span class='Paren'>(</span><span class='Number'>0</span><span class='Function'>∾+</span><span class='Modifier'>`</span><span class='Value'>c</span><span class='Paren'>)</span><span class='Modifier2'>⊸</span><span class='Function'>//</span><span class='Paren'>(</span><span class='Value'>𝕩</span><span class='Function'>=</span><span class='Value'>lf</span><span class='Paren'>)</span><span class='Function'>∾</span><span class='Number'>1</span><span class='Bracket'>⟩</span> <span class='Comment'># Matching close indices
</span> <span class='Function'>Se</span><span class='Gets'>←</span><span class='Brace'>{</span><span class='Paren'>(</span><span class='Function'>⊏</span><span class='Modifier'>˜</span><span class='Value'>𝕨</span><span class='Paren'>)</span><span class='Function'>Se</span> <span class='Number'>1</span><span class='Modifier'>¨</span><span class='Modifier2'>⌾</span><span class='Paren'>((</span><span class='Value'>𝕩</span><span class='Function'>/</span><span class='Value'>𝕨</span><span class='Paren'>)</span><span class='Modifier2'>⊸</span><span class='Function'>⊏</span><span class='Paren'>)</span><span class='Value'>𝕩</span><span class='Brace'>}</span><span class='Modifier2'>⍟</span><span class='Paren'>(</span><span class='Number'>0</span><span class='Function'>=</span><span class='Number'>¯1</span><span class='Function'>⊑⊢</span><span class='Paren'>)</span> <span class='Comment'># Mark reachable openings
</span>
<span class='Function'>PrecedesGroup</span> <span class='Gets'>←</span> <span class='Brace'>{</span>
<span class='Comment'># We prepend a 0 to 𝕨, so that 0 is the "before start" index, with a
</span> <span class='Comment'># false value, and normal indices are increased by 1.
</span> <span class='Value'>𝕨</span> <span class='Function'>∾</span><span class='Modifier'>˜</span><span class='Gets'>↩</span> <span class='Number'>0</span>
<span class='Value'>inds</span> <span class='Gets'>←</span> <span class='Number'>1</span> <span class='Function'>+</span> <span class='Function'>↕≠</span><span class='Value'>𝕩</span>
<span class='Comment'># Zero out indices where 𝕩 was true, and find the greatest index so
</span> <span class='Comment'># far at each position.
</span> <span class='Value'>last</span> <span class='Gets'>←</span> <span class='Function'>⌈</span><span class='Modifier'>`</span> <span class='Value'>inds</span> <span class='Function'>×</span> <span class='Function'>¬</span><span class='Value'>𝕩</span>
<span class='Value'>last</span> <span class='Function'>⊏</span> <span class='Value'>𝕨</span>
<span class='Brace'>}</span>
</pre>
<pre class="Julia"><span class='Value ul'>Julia Mono</span>
<span class='Value'>c</span><span class='Gets'>←</span><span class='Value'>𝕩</span><span class='Function'>=</span><span class='String'>'#'</span><span class='Separator'>⋄</span><span class='Value'>s</span><span class='Gets'>←</span><span class='Function'>/</span><span class='Number'>0</span><span class='Ligature'>‿</span><span class='Number'>0</span><span class='Modifier2'>⊸</span><span class='Function'>«</span><span class='Modifier2'>⊸</span><span class='Function'>∧</span><span class='Value'>sm</span><span class='Gets'>←</span><span class='Value'>𝕩</span><span class='Function'>=</span><span class='String'>'''</span><span class='Separator'>⋄</span><span class='Value'>d</span><span class='Gets'>←</span><span class='Function'>/</span><span class='Value'>dm</span><span class='Gets'>←</span><span class='Value'>𝕩</span><span class='Function'>=</span><span class='String'>'"'</span>
<span class='Value'>g</span><span class='Gets'>←</span><span class='Function'>⍋</span><span class='Value'>q</span><span class='Gets'>←</span><span class='Function'>∾</span><span class='Bracket'>⟨</span> <span class='Value'>s</span><span class='Separator'>⋄</span><span class='Number'>¯1</span><span class='Function'>↓</span><span class='Value'>d</span><span class='Separator'>⋄</span><span class='Function'>/</span><span class='Value'>c</span><span class='Bracket'>⟩</span> <span class='Separator'>⋄</span><span class='Value'>q</span><span class='Gets'>↩</span><span class='Value'>g</span><span class='Function'>⊏</span><span class='Value'>q</span> <span class='Comment'># Open indices
</span> <span class='Value'>e</span><span class='Gets'>←</span> <span class='Value'>g</span><span class='Function'>⊏∾</span><span class='Bracket'>⟨</span><span class='Number'>2</span><span class='Function'>+</span><span class='Value'>s</span><span class='Separator'>⋄</span> <span class='Number'>1</span><span class='Function'>↓</span><span class='Value'>d</span><span class='Separator'>⋄</span><span class='Function'>-</span><span class='Modifier2'>⟜</span><span class='Function'>»</span><span class='Modifier2'>∘</span><span class='Function'>⊏</span><span class='Modifier2'>⟜</span><span class='Paren'>(</span><span class='Number'>0</span><span class='Function'>∾+</span><span class='Modifier'>`</span><span class='Value'>c</span><span class='Paren'>)</span><span class='Modifier2'>⊸</span><span class='Function'>//</span><span class='Paren'>(</span><span class='Value'>𝕩</span><span class='Function'>=</span><span class='Value'>lf</span><span class='Paren'>)</span><span class='Function'>∾</span><span class='Number'>1</span><span class='Bracket'>⟩</span> <span class='Comment'># Matching close indices
</span> <span class='Function'>Se</span><span class='Gets'>←</span><span class='Brace'>{</span><span class='Paren'>(</span><span class='Function'>⊏</span><span class='Modifier'>˜</span><span class='Value'>𝕨</span><span class='Paren'>)</span><span class='Function'>Se</span> <span class='Number'>1</span><span class='Modifier'>¨</span><span class='Modifier2'>⌾</span><span class='Paren'>((</span><span class='Value'>𝕩</span><span class='Function'>/</span><span class='Value'>𝕨</span><span class='Paren'>)</span><span class='Modifier2'>⊸</span><span class='Function'>⊏</span><span class='Paren'>)</span><span class='Value'>𝕩</span><span class='Brace'>}</span><span class='Modifier2'>⍟</span><span class='Paren'>(</span><span class='Number'>0</span><span class='Function'>=</span><span class='Number'>¯1</span><span class='Function'>⊑⊢</span><span class='Paren'>)</span> <span class='Comment'># Mark reachable openings
</span>
<span class='Function'>PrecedesGroup</span> <span class='Gets'>←</span> <span class='Brace'>{</span>
<span class='Comment'># We prepend a 0 to 𝕨, so that 0 is the "before start" index, with a
</span> <span class='Comment'># false value, and normal indices are increased by 1.
</span> <span class='Value'>𝕨</span> <span class='Function'>∾</span><span class='Modifier'>˜</span><span class='Gets'>↩</span> <span class='Number'>0</span>
<span class='Value'>inds</span> <span class='Gets'>←</span> <span class='Number'>1</span> <span class='Function'>+</span> <span class='Function'>↕≠</span><span class='Value'>𝕩</span>
<span class='Comment'># Zero out indices where 𝕩 was true, and find the greatest index so
</span> <span class='Comment'># far at each position.
</span> <span class='Value'>last</span> <span class='Gets'>←</span> <span class='Function'>⌈</span><span class='Modifier'>`</span> <span class='Value'>inds</span> <span class='Function'>×</span> <span class='Function'>¬</span><span class='Value'>𝕩</span>
<span class='Value'>last</span> <span class='Function'>⊏</span> <span class='Value'>𝕨</span>
<span class='Brace'>}</span>
</pre>
<p style="margin-top:4em">Finally, a REPL where you can enter any code you like (but remember, not all characters from these fonts are embedded—just those likely to be used in BQN).</code>
<div class="fonts">
<input type="radio" id="f0" name="font" class="DejaVu" checked="checked"/>
<label for="f0">DejaVu</label>
<input type="radio" id="f1" name="font" class="BQN386"/>
<label for="f1">BQN386</label>
<input type="radio" id="f2" name="font" class="Fairfax"/>
<label for="f2">Fairfax</label>
<input type="radio" id="f3" name="font" class="Julia"/>
<label for="f3">Julia</label>
</div>
<div id="setfont">
<div class="cont">
<div class="kb"></div>
<textarea class="code" rows="8"></textarea>
<input class="run" type="submit" value="Run (or shift-enter)"/>
</div>
<pre class="rslt"></pre>
</div>
<script src="bqn.js"></script>
<script src="repl.js"></script>
<script>
let sf = document.getElementById("setfont");
document.body.querySelectorAll('input[name="font"]')
.forEach(i => i.onclick = e=>{sf.className=e.target.className;});
</script>
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