charCodeAt0

charCodeAt0 is a JavaScript string method that returns the Unicode value of the character at a specified index within a string. The index is zero-based, meaning the first character is at index 0, the second at index 1, and so on. If the index is out of bounds (i.e., less than 0 or greater than or equal to the string's length), charCodeAt0 returns NaN (Not a Number). This method is useful for retrieving numerical representations of characters, which can then be used for various comparisons or manipulations. For example, it can be used to determine if a character is an uppercase letter, a lowercase letter, a digit, or a symbol by comparing its Unicode value against known ranges. Unlike methods like charAt0, which returns the character itself as a string, charCodeAt0 provides the integer Unicode code point.