elm/core

[String] No way to access nth character of string

Opened this issue · 2 comments

danielFHcode commented

Currently, it seems there is no method to get the nth character of a string in the standard library, I'm pretty sure the only way to do so is to first convert it into a list, then into an array, then to use Array.get:

get : Int -> String -> Maybe Char
get index string = string |> String.toList |> List.toArray |> Array.get index

Which takes linier time complexity for something which should be constant. Alternatively you could do String.slice index (index+1) string but that would return a string and not a char.

Is there a reason for the lack of this seemingly basic feature? Or am I missing an existing method, in which case maybe the documentation needs to be updated to make it clearer how to do this?

github-actions commented

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