What is charCodeAt() in JS?

Overview

The charCodeAt method is defined in the String class in JS, and returns the UTF-16 code for the specified character inside the string.

Syntax

charCodeAt(index);

Parameters

• The index is the number that specifies the position of a character inside the string. index must be greater than or equal to 0, and less than the length of the string. index defaults to the value of 0 if index is not a number.

Return value

• The UTF-16 code, for the character specified by index, is returned.
• If index is out of range, NaN is returned.

Example

In the example above, the charCodeAt method is invoked on the str string with the index value 4. The returned character code (111) is the UTF-16 code for the character o.