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<head>
<link href="../favicon.ico" rel="shortcut icon" type="image/x-icon"/>
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<title>BQN: Advent of Code</title>
</head>
<div class="nav">(<a href="https://github.com/mlochbaum/BQN">github</a>) / <a href="../index.html">BQN</a> / <a href="index.html">community</a></div>
<h1 id="advent-of-code"><a class="header" href="#advent-of-code">Advent of Code</a></h1>
<p><a href="https://adventofcode.com/2021">Advent of Code 2021</a> saw great participation by the BQN community, with a total of 233 solutions published by 22 programmers. They can be found in these repositories:</p>
<center>
<p><a href="https://github.com/dzaima/aoc/tree/master/2021/BQN">dzaima</a> •
<a href="https://github.com/dancek/bqn-advent2021">Hannu Hartikainen</a> •
<a href="https://github.com/razetime/AOC2021-BQN">Raghu Ranganathan</a> •
<a href="https://github.com/frasiyav/AoC2021">frasiyav</a> •
<a href="https://github.com/leahneukirchen/adventofcode2021">Leah Neukirchen</a> •
<a href="https://github.com/Detegr/aoc2021">Antti Keränen</a> •
<a href="https://gitlab.com/icen/aoc21">Caleb Quilley</a> •
<a href="https://github.com/AlexDikelsky/puzzles/tree/main/advent_of_code/advent_2021">Alex Dikelsky</a> •
<a href="https://github.com/alvinvoo/aoc2021">Alvin Voo</a> •
<a href="https://github.com/andreypopp/aoc2021">Andrey Popp</a> •
<a href="https://github.com/JohnnyJayJay/adventofcode-21">Johnny</a> •
<a href="https://git.sr.ht/~jshholland/adventofcode/tree/master/item/2021">Josh Holland</a> •
<a href="https://github.com/bddean/aoc-2021">Ben Dean</a> •
<a href="https://github.com/alephno/aoc2021/tree/main/BQN">Alastair Williams</a> •
<a href="https://github.com/Olodus/advent_of_code2021">Olodus</a> •
<a href="https://github.com/arwn/aoc2021">Aren Windham</a> •
<a href="https://github.com/dlozeve/aoc2021">Dimitri Lozeve</a> •
<a href="https://github.com/knightzmc/advent-of-code-2021">Alexander Wood</a> •
<a href="https://github.com/mathiasmagnusson/advent-of-code-21">Mathias Magnusson</a> •
<a href="https://github.com/m-lima/advent-of-code-2021">m-lima</a> •
<a href="https://github.com/dunyakirkali/aoc.bqn/tree/main/2021">Dunya Kirkali</a> •
<a href="https://github.com/Camto/Advent-of-Code-2021/tree/master/BQN">Benjamin Applegate</a></p>
</center>
<p>Below, problems solved in BQN are shown in green, and problems solved in other languages in dark red.</p>
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<text font-size='20px' x='340' y='24'>Day</text>
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<text x='100' y='46'>1</text>
<text x='120' y='46'>2</text>
<text x='140' y='46'>3</text>
<text x='160' y='46'>4</text>
<text x='180' y='46'>5</text>
<text x='200' y='46'>6</text>
<text x='220' y='46'>7</text>
<text x='240' y='46'>8</text>
<text x='260' y='46'>9</text>
<text x='280' y='46'>10</text>
<text x='300' y='46'>11</text>
<text x='320' y='46'>12</text>
<text x='340' y='46'>13</text>
<text x='360' y='46'>14</text>
<text x='380' y='46'>15</text>
<text x='400' y='46'>16</text>
<text x='420' y='46'>17</text>
<text x='440' y='46'>18</text>
<text x='460' y='46'>19</text>
<text x='480' y='46'>20</text>
<text x='500' y='46'>21</text>
<text x='520' y='46'>22</text>
<text x='540' y='46'>23</text>
<text x='560' y='46'>24</text>
<text x='580' y='46'>25</text>
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<text x='10' y='65'>dzaima</text>
<text x='10' y='83'>Hannu</text>
<text x='10' y='101'>Raghu</text>
<text x='10' y='119'>frasiyav</text>
<text x='10' y='137'>Leah</text>
<text x='10' y='155'>Antti</text>
<text x='10' y='173'>Caleb</text>
<text x='10' y='191'>Alex</text>
<text x='10' y='209'>Alvin</text>
<text x='10' y='227'>Andrey</text>
<text x='10' y='245'>Johnny</text>
<text x='10' y='263'>Josh</text>
<text x='10' y='281'>Ben</text>
<text x='10' y='299'>Alastair</text>
<text x='10' y='317'>Olodus</text>
<text x='10' y='335'>Aren</text>
<text x='10' y='353'>Dimitri</text>
<text x='10' y='371'>Alexander</text>
<text x='10' y='389'>Mathias</text>
<text x='10' y='407'>m-lima</text>
<text x='10' y='425'>Dunya</text>
<text x='10' y='443'>Benjamin</text>
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<p>In addition to these, Leah wrote two blog posts explaining her solutions for <a href="https://leahneukirchen.org/blog/archive/2021/12/counting-lanternfish-with-bqn-and-linear-algebra.html">day 6</a> and <a href="https://leahneukirchen.org/blog/archive/2021/12/surveying-lava-basins-with-bqn-and-fixpoints.html">day 9</a>.</p>
<p>The number of BQN solutions for each of the 25 days is plotted below, along with totals from AoC's <a href="https://adventofcode.com/2021/stats">stats page</a>. The BQN solutions are scaled to be visible here: there are 6828 times more valid AoC submissions than published BQN solutions overall.</p>
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<text x='256' y='9'>Solutions in:</text>
<text class='red' x='256' y='27'>Anything</text>
<text class='green' x='256' y='45'>BQN</text>
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<text dy='1em' x='128' y='128'>day</text>
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<path class='red' style='fill:none' d='M0 0L10.667 21.122L21.333 34.102L32 66.959L42.667 74.553L53.333 74.245L64 77.333L74.667 82.701L85.333 86.213L96 90.435L106.667 95.042L117.333 99.219L128 98.637L138.667 98.499L149.333 104.789L160 108.939L170.667 109L181.333 114.175L192 118.798L202.667 115.309L213.333 113.605L224 116.203L234.667 119.708L245.333 121.228L256 119.294'/>
<path class='green' style='fill:none' d='M0 51.357L10.667 71.526L21.333 55.39L32 79.594L42.667 75.56L53.333 67.492L64 67.492L74.667 87.661L85.333 75.56L96 87.661L106.667 87.661L117.333 95.729L128 87.661L138.667 95.729L149.333 95.729L160 103.797L170.667 95.729L181.333 99.763L192 111.865L202.667 99.763L213.333 103.797L224 111.865L234.667 123.966L245.333 115.898L256 111.865'/>
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<p>The BQN counts fall off much less than the average. Most likely this is because programmers who decide to try AoC in a crazy new language like BQN tend to be more committed to the task, but BQN also has to meet some minimum bar to enable these crazy people to continue.</p>
<p>Just how okay is BQN? Hannu makes a case for optimism in <a href="https://hannuhartikainen.fi/blog/advent-of-bqn/">this blog post</a>. Hannu writes that BQN's slogan "might be the best [further glowing praise/context]", in stark contrast to that time <a href="https://adspthepodcast.com/2021/12/17/Episode-56.html">Bryce and Conor agreed</a> that it was a bad slogan. And Andrey offers <a href="https://news.ycombinator.com/item?id=29521264">suspiciously positive comments</a> as well. The list includes "good text editor support", but Johnny remarked on the forums that he didn't manage a good editor/REPL setup—a second contradiction, meaning that I can now prove the Riemann hypothesis in <em>two</em> independent ways. Johnny also cited little support for string handling and low-information error messages as obstacles. I like that these aren't tied to the core language, and can eventually be improved, even though it won't be easy. dzaima complained about frequent confusion between functions and immediate blocks, and right-to-left folds being the much less useful direction. I dislike that dzaima is right a lot.</p>
<p>All three non-dzaimas of the last paragraph are essentially array outsiders, with little or no experience with languages like J or APL. In fact I think this describes the majority of Adventurers in BQN (although the list also includes array junkies like Raghu and Leah, and they've predictably made it further than most participants). Reaching out to a general programming audience wasn't initially a goal of BQN because I didn't think it <em>was</em> within reach. I realized this was wrong, and began to adjust course, in the early days, but am pleased to continue getting even more wrong.</p>
<p>With all this said, a handful of reports about recreational programming is a pretty poor basis for judging a programming language. Advent of Code was more useful as a checkup on BQN and its environment, resulting in fixes to documentation and implementation. And dzaima improved various aspects of performance as a way to cheat in speed battles with ngn/k.</p>
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