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

charCodeAt Summary

Returns the Unicode value of the character at the specified location.

Syntax

strObj. charCodeAt( index )

strObj: Required. Any String object or string literal.
index: Required. The zero-based index of the desired character. If there is no character at the specified index, NaN is returned.

Examples

The following example illustrates the use of the charCodeAt method.

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