Description

The JavaScript method charAt() returns the character at a specified index in a string.

The below table summarizes its usage.

Usage Details
Syntax str.charAt(index)
  • str is a string
Parameters index
  • An integer between 0 and str.length - 1.
  • If the index cannot be converted to an integer or is not provided, then the default value 0 is used.
Result Returns a string representing the character at the specified index of an array.
Category String Methods

Example 1: Using the method with an integer index value

For a valid integer index value, the method returns the character from the specified index.

var str = "Hello World!";

// Finding the character at index 6
document.write("Character at index 6 is : " + str.charAt(6));

Output:

Character at index 6 is : W

Example 2: Using the method with a non-integer index value

For a non-integer (or floating-point) index value, the method returns the character from the index determined by ignoring the decimal digits.

var str = "Hello World!";

// Finding character at index 6.3
document.write("Character at index 6.3 is : " + str.charAt(6.3));

// Finding character at index 6.9
document.write("Character at index 6.3 is : " + str.charAt(6.9));

// Finding character at index 6
document.write("Character at index 6.3 is : " + str.charAt(6));

Output:

Character at index 6.3 is : W
Character at index 6.9 is : W
Character at index 6 is : W

Example 3: Using the method without passing index value

When the index value is not passed, the method returns the character from the default index (which is 0) of the string.

var str = "Hello World!";

// Finding the character at default index, without passing index value.
document.write("Character at default index is : " + str.charAt());

// Finding the character at index 0
document.write("Character at index 0 is : " + str.charAt(0));

Output:

Character at default index is : H
Character at index 0 is : H

Example 4: Using the method with an index value out of range

When the index value is out of range, the method returns an empty string.

var str = "Hello World!";

// Finding the character at index 100
document.write("Character at index 100 is : " + str.charAt(100));

// Finding the character at index -10
document.write("Character at index -10 is : " + str.charAt(-10));

Output:

Character at index 100 is : 
Character at index -10 is :

Overall

The JavaScript method charAt() returns the character at a specified index in a string.

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