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JavaScript String charCodeAt() Method

JavaScript string charCodeAt() Method with example, by string literal, by string object (using new keyword), javascript string methods, charAt(index) method, concat(str) method, indexOf(str) method, lastIndexOf(str) method, lowerCase() method, upperCase() method, slice(beginIndex, endIndex) method, trim() method, toLowerCase(), slice(), concat(), charCodeAt() method etc.

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JavaScript String charCodeAt() Method

The JavaScript string charCodeAt() method is used to find out the Unicode value of a character at the specific index in a string.

The index number starts from 0 and goes to n-1, where n is the length of the string. It returns NaN if the given index number is either a negative number or it is greater than or equal to the length of the string.

Syntax

The charCodeAt() method is represented by the following syntax:

string.charCodeAt(index)

Parameter

index - It represent the position of a character.

Return

A Unicode value

JavaScript String charCodeAt() Method Example

Let's see some simple examples of charCodeAt() method.

Example 1

Here, we will print the Unicode value of a character by passing its specific index.

<script>
var x="TheDeveloperBlog";
document.writeln(x.charCodeAt(3));
</script>
Test it Now

Output:

97

Example 2

In this example, we will not pass any index number with the method. In such case, it will return the Unicode value of first character.

<script>
var x="TheDeveloperBlog";
document.writeln(x.charCodeAt());//It will return Unicode value of 'J'
</script>
Test it Now

Output:

74

Example 3

Here, we will print the Unicode value of last character in a string.

<script>
var x="TheDeveloperBlog";
document.writeln(x.charCodeAt(x.length-1));
</script>
Test it Now

Output:

116

Example 4

Here, we will provide the index number greater than the length of the string. In such case, the method returns NaN.

<script>
var x="TheDeveloperBlog";
document.writeln(x.charCodeAt(12));
 </script>
Test it Now

Output:

NaN

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