TypeScript String length
Syntax & Examples

String.length property

The `length` property of a String object represents the number of characters in the string, including spaces, punctuation, and other special characters.

Syntax of String.length

The syntax of String.length property is:

length: number

This length property of String returns the length of the string, which is a non-negative integer.

Return Type

String.length returns value of type number.


✐ Examples

1 Using the length property to get the string length

You can use the `length` property to determine the number of characters in a string.

For example,

  1. Define a string variable str with some text.
  2. Access the length property of the string.
  3. Store the length in a variable or use it directly in your logic.
  4. Log the length to the console using the console.log() method.

TypeScript Program

const str = 'Hello, World!';
const length = str.length;
console.log(length);

Output

13

2 Using length property with an empty string

The `length` property of an empty string is always 0.

For example,

  1. Define an empty string variable emptyStr.
  2. Access the length property of the empty string.
  3. Log the length to the console using the console.log() method.

TypeScript Program

const emptyStr = '';
console.log(emptyStr.length);

Output

0

3 Using the length property for string manipulation

The `length` property can be used to dynamically determine the range of a loop for iterating through each character in a string.

For example,

  1. Define a string variable str with some text.
  2. Use a for loop with the condition based on str.length.
  3. Log each character to the console using the loop.

TypeScript Program

const str = 'Hello';
for (let i = 0; i < str.length; i++) {
  console.log(str[i]);
}

Output

H
E
L
L
O

Summary

In this TypeScript tutorial, we learned about length property of String: the syntax and few working examples with output and detailed explanation for each example.