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Diffstat (limited to 'docs/doc/pick.html')
| -rw-r--r-- | docs/doc/pick.html | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/docs/doc/pick.html b/docs/doc/pick.html index d3166012..a5e9392b 100644 --- a/docs/doc/pick.html +++ b/docs/doc/pick.html @@ -57,9 +57,9 @@ </pre> <p>If <code><span class='Value'>𝕩</span></code> is empty then First results in an error, like Pick.</p> <a class="replLink" title="Open in the REPL" target="_blank" href="https://mlochbaum.github.io/BQN/try.html#code=4oqRICIiCuKKkSDiiaLPgA==">↗️</a><pre> <span class='Function'>⊑</span> <span class='String'>""</span> -ERROR +<span class='Error'>Error: ⊑: Argument cannot be empty</span> <span class='Function'>⊑</span> <span class='Function'>≢</span><span class='Number'>π</span> -ERROR +<span class='Error'>Error: ⊑: Argument cannot be empty</span> </pre> <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> @@ -84,7 +84,7 @@ ERROR </pre> <p>These indices have to be lists, since if they're numbers it just looks like <code><span class='Value'>𝕨</span></code> is one list index.</p> <a class="replLink" title="Open in the REPL" target="_blank" href="https://mlochbaum.github.io/BQN/try.html#code=4p+oMiwxLDAswq8x4p+pIOKKkSAiYWJjIiAgIyDwnZWpIGRvZXNuJ3QgaGF2ZSByYW5rIDQhCgrin6gyLDEsMCzCrzHin6kg4qWKwqjiirjiipEgImFiYyIKCuKfqDIsMSwwLMKvMeKfqSDiio8gImFiYyIgICMgQmV0dGVyIHdheQ==">↗️</a><pre> <span class='Bracket'>⟨</span><span class='Number'>2</span><span class='Separator'>,</span><span class='Number'>1</span><span class='Separator'>,</span><span class='Number'>0</span><span class='Separator'>,</span><span class='Number'>¯1</span><span class='Bracket'>⟩</span> <span class='Function'>⊑</span> <span class='String'>"abc"</span> <span class='Comment'># 𝕩 doesn't have rank 4! -</span>ERROR +</span><span class='Error'>Error: ⊑: Picking item at wrong rank (index 2‿1‿0‿¯1 in array of shape ⟨3⟩)</span> <span class='Bracket'>⟨</span><span class='Number'>2</span><span class='Separator'>,</span><span class='Number'>1</span><span class='Separator'>,</span><span class='Number'>0</span><span class='Separator'>,</span><span class='Number'>¯1</span><span class='Bracket'>⟩</span> <span class='Function'>⥊</span><span class='Modifier'>¨</span><span class='Modifier2'>⊸</span><span class='Function'>⊑</span> <span class='String'>"abc"</span> "cbac" @@ -124,5 +124,5 @@ ERROR ┘ <span class='Bracket'>⟨⟨</span><span class='Number'>2</span><span class='Separator'>,</span><span class='Number'>3</span><span class='Bracket'>⟩</span><span class='Separator'>,</span><span class='Number'>1</span><span class='Bracket'>⟩</span> <span class='Function'>⊑</span> <span class='Value'>a</span> <span class='Comment'># 1 isn't a valid index -</span>ERROR +</span><span class='Error'>Error: ⊑: 𝕨 contained list with mixed-type elements</span> </pre> |