JavaScript String charCodeAt() Method

The JavaScript str.charCodeAt() method returns a Unicode character set code unit of the character present at the index in the string specified as the argument. The index number ranges from 0 to n-1, where n is the string’s length.

Syntax:

str.charCodeAt(index)

Parameters:

This method accepts a single parameter.

• index: It is the index of the character in the string whose Unicode is to be used. The range of the index is from 0 to length – 1. 

Return value:

This method returns the Unicode (ranging between 0 and 65535) of the character whose index is provided to the method as the argument. If the index provided is out of range this method returns NaN

Note: The str.charCodeAt(index) method does not change the value of the original string.

Example 1: This example shows the basic use of the String.prototype.charCodeAt() Method.

function func() {
    let str = 'GEEKS';
    let value = str.charCodeAt(0);
    console.log(value);
}

func();

71

Example 2: In this example, the method charCodeAt() extracts the character from the string at index 4. Since this character is m, therefore this method returns the Unicode sequence as 109.

// JavaScript to illustrate charCodeAt() method
function func() {
    let str = 'ephemeral';

    // Finding the code of the character at
    // given index
    let value = str.charCodeAt(4);
    console.log(value);
}

func();

109

Example 3: In this example, the method charCodeAt() extracts the character from the string at index 20. Since the index is out of bounds for the string, therefore this method returns the answer as NaN. 

// JavaScript to illustrate charCodeAt() method
function func() {
    let str = 'ephemeral';

    // Finding the code of the character
    // at given index
    let value = str.charCodeAt(20);

    console.log(value);
}
func();

NaN

Supported Browsers:

• Chrome 1
• Edge 12
• Firefox 1
• safari 1
• Opera 4