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Explicit String.at/2 access cost and alternatives #13838

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Merged
merged 3 commits into from
Sep 19, 2024
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Explicit String.at/2 access cost and alternatives #13838

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a865d06
Explicit access cost and alternatives in String.at/2 doc
sabiwara Sep 19, 2024
d3f9843
Use admonition block
sabiwara Sep 19, 2024
ac86a2b
Use admonition block for String.split_at/2 too
sabiwara Sep 19, 2024
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4 changes: 4 additions & 0 deletions lib/elixir/lib/string.ex
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Expand Up @@ -2231,6 +2231,10 @@ defmodule String do
Returns the grapheme at the `position` of the given UTF-8 `string`.
If `position` is greater than `string` length, then it returns `nil`.

Note: keep in mind this function has to linearly traverse the string.
If you want to access a string or a binary in constant time based on the
number of bytes, use `Kernel.binary_slice/3` or `:binary.at/2` instead.

## Examples

iex> String.at("elixir", 0)
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