Question 49666 in Javascript Question posted in
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Difference between .at(index) and .charAt(index) – Javascript

What is the difference between the following two functions?

let str = 'hello world';
str.at(6) // w
str.charAt(6) // w

The only difference that I can find in the documentation is that .at() accepted negative indices, is there another difference?

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2

Answers


  1. 0

    Both methods will return a new string consisting of a single UTF-16 encoded character located at the specified offset o the string.

    The difference is that .at accepts negative numbers, and it is a much newer feature, so older versions of some engines might not support it.

    Another difference is the default value returned if the number provided as a parameter exceeds the length of the string. .at will return undefined while .charAt will return an empty string.

    You can find more information here (.at()) and here (.charAt())

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  2. 0

    There are few things I can recall:

    • obviously browser support, at() is newer
    • when out of range, at() returns undefined and charAt() returns an empty string
    • negative indices (already mentioned by you)
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