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JavaScript String.prototype.charCodeAt() Method

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  • Last Updated : 04 Jan, 2023
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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. 

Syntax:

str.charCodeAt(index)

Parameters: 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

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

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

JavaScript




<script>
    function func() {
        var str = 'GEEKS';
        var value = str.charCodeAt(0);
        console.log(value);    
    }
      
    func();
</script>

Output:

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




<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);
        console.log(value);    
    }
      
    func();
</script>

Output:

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




<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);
      
        console.log(value);    
    }
    func();
</script>

Output:

NaN

We have a complete list of Javascript string methods, to check those please go through this Javascript String Complete reference article.

Supported Browsers: 

  • Chrome 1 and above
  • Edge 12 and above
  • Firefox 1 and above
  • Internet Explorer 4 and above
  • safari 1 and above
  • Opera 4 and above

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