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JavaScript - How to Use the String length Property in JavaScript

The length property of a String object returns the number of characters contained in a string.

const str = 'Get the length of this string';
console.log(str.length);
// Expected output: 29

In the example above, str is a String containing 29 characters.

The length property counts all characters, including blank spaces and special characters.

Knowing the length of a String is useful in multiple different scenarios:

  • Looping through a string with a for statement
  • Displaying a shortened version of a string if the text is too long
  • Verifying that a certain number of characters were entered for an input (e.g. username or password)

There are many more scenarios where String.length is useful – the only limit is your imagination.

Syntax

The syntax of the String object’s length property is as follows:

String.length

This property returns the length of the associated string.

The length of an empty string is 0 (zero).

The maximum length of a String is the maximum value of the Number data type, which in most cases is 253 – 1 (note: the maximum value of the Number data type can vary based on the underlying implementation of the JavaScript standard).

 

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