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Showing content from https://webplatform.github.io/docs/javascript/String/charAt below:

charAt · WebPlatform Docs

charAt Summary

Returns the character at the specified index.

Syntax

strObj. charAt( index )

strObj: Required. Any String object or string literal.
index: Required. The zero-based index of the desired character.

Examples

The following example illustrates the use of the charAt method:

var str = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
 document.write(str.charAt(str.length - 1));

Remarks

The charAt method returns a character value equal to the character at the specified index. The first character in a string is at index 0, the second is at index 1, and so forth. Values of index that are out of range return an empty string.