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| author | Marshall Lochbaum <mwlochbaum@gmail.com> | 2021-07-07 12:38:38 -0400 |
|---|---|---|
| committer | Marshall Lochbaum <mwlochbaum@gmail.com> | 2021-07-07 12:38:38 -0400 |
| commit | 8d9506d2fe2063d9b5d4604e5d3d7c2b2ce3df56 (patch) | |
| tree | 9b3940ed311d9a71d67ccef0155f54b2b185ed31 | |
| parent | 4d602ea36183e62e463cea08900a16ea6240a03f (diff) | |
Mention ¯1⊑ as the obvious way to get the last element
| -rw-r--r-- | doc/pick.md | 3 | ||||
| -rw-r--r-- | docs/doc/pick.html | 6 |
2 files changed, 6 insertions, 3 deletions
diff --git a/doc/pick.md b/doc/pick.md index 12a7003c..425b8cf9 100644 --- a/doc/pick.md +++ b/doc/pick.md @@ -52,9 +52,10 @@ If `𝕩` is empty then Pick always results in an error. First never gives an er So one way to find the fill element for an array `𝕩` of any shape is `⊑0⥊𝕩`. -In APL it's common to get the last element of a list with an idiom that translates to `⊑⌽`, or First-[Reverse](reverse.md). I prefer to use [Fold](fold.md) with the Right [identity function](identity.md). +In APL it's common to get the last element of a list with an idiom that translates to `⊑⌽`, or First-[Reverse](reverse.md). In BQN the most straightforward way is to select with index `¯1` instead. I also sometimes use [Fold](fold.md) with the Right [identity function](identity.md). ⊑⌽ "last" + ¯1⊑ "last" ⊢´ "last" ## Many elements diff --git a/docs/doc/pick.html b/docs/doc/pick.html index 3f5495aa..0926b3a0 100644 --- a/docs/doc/pick.html +++ b/docs/doc/pick.html @@ -64,8 +64,10 @@ ⟨ " " ⟨ 0 0 0 0 ⟩ ⟩ </pre> <p>So one way to find the fill element for an array <code><span class='Value'>𝕩</span></code> of any shape is <code><span class='Function'>⊑</span><span class='Number'>0</span><span class='Function'>⥊</span><span class='Value'>𝕩</span></code>.</p> -<p>In APL it's common to get the last element of a list with an idiom that translates to <code><span class='Function'>⊑⌽</span></code>, or First-<a href="reverse.html">Reverse</a>. I prefer to use <a href="fold.html">Fold</a> with the Right <a href="identity.html">identity function</a>.</p> -<a class="replLink" title="Open in the REPL" target="_blank" href="https://mlochbaum.github.io/BQN/try.html#code=4oqR4oy9ICJsYXN0IgriiqLCtCAibGFzdCI=">↗️</a><pre> <span class='Function'>⊑⌽</span> <span class='String'>"last"</span> +<p>In APL it's common to get the last element of a list with an idiom that translates to <code><span class='Function'>⊑⌽</span></code>, or First-<a href="reverse.html">Reverse</a>. In BQN the most straightforward way is to select with index <code><span class='Number'>¯1</span></code> instead. I also sometimes use <a href="fold.html">Fold</a> with the Right <a href="identity.html">identity function</a>.</p> +<a class="replLink" title="Open in the REPL" target="_blank" href="https://mlochbaum.github.io/BQN/try.html#code=4oqR4oy9ICJsYXN0IgrCrzHiipEgImxhc3QiCuKKosK0ICJsYXN0Ig==">↗️</a><pre> <span class='Function'>⊑⌽</span> <span class='String'>"last"</span> +'t' + <span class='Number'>¯1</span><span class='Function'>⊑</span> <span class='String'>"last"</span> 't' <span class='Function'>⊢</span><span class='Modifier'>´</span> <span class='String'>"last"</span> 't' |