JavaScript String.prototype.charCodeAt() Method

Last Updated : 05 Oct, 2021

Below is the example of the String.prototype.charCodeAt() Method.

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Example:

<script>
function func() {
    var str = 'GEEKS';
    var value = str.charCodeAt(0);
    document.write(value);
}

func();
</script>
Output:
```
71
```

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 syntax of the method is as follows:

str.charCodeAt(index)

Arguments
The only argument to this method 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.

Examples for the above method are provided below:

Example 1:

Input:
var str = 'ephemeral';
print(str.charCodeAt(4));

Output:
109

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.

Example 2:

Input:
var str = 'ephemeral';
print(str.charCodeAt(20));

Output:
NaN

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.

Codes for the above method are provided below:

Program 1:

<script>
// JavaScript to illustrate charCodeAt() method
  
function func() {
    var str = 'ephemeral';
  
    // Finding the code of the character at
    // given index 
    var value = str.charCodeAt(4);
    document.write(value);    
}
  
func();
</script>

Output:

Program 2:

<script>
// JavaScript to illustrate charCodeAt() method
  
function func() {
    var str = 'ephemeral';
  
    // Finding the code of the character 
    // at given index 
    var value = str.charCodeAt(20);
  
    document.write(value);    
}
func();
</script> 