JavaScript String() Constructor

Last Updated : 16 Jul, 2024

The JavaScript String() Constructor is used to can be used as a constructor or a function. that creates a new string object. It can be used in two different ways:

Syntax:

Invoked with the new keyword:

new String(object);

Invoked without the new keyword:

String(object);

Parameters:

This constructor accepts a single argument as mentioned above and described below:

object: This parameter contains a value that is to be converted to a string value.

Return Value:

When the String() constructor is used with the new keyword to create a new string object, it returns the newly created string object.
when the String() constructor is used without the new keyword, it behaves differently and returns a primitive string value rather than a string object.

Example 1: Here is the basic example of a javascript String() constructor.

JavaScript

// Using with new keyword
let str = new String("Geeks");
console.log(str); 

// Using without keyword
let strValue = String("Geeks");
console.log(strValue);

Output

[String: 'Geeks']
Geeks

Example 2: In this example, we will create a basic string using String Constructor.

JavaScript

function func() {
    let value = String("John");
    console.log(value);
}
func();

Output

John

Example 3: In this example, we will convert a Boolean to String. the string constructor acts as a Function that will convert the Boolean to String

JavaScript

function geek() {
    let x = Boolean(1);
    let y = Boolean(0);
    console.log(String(x));
    console.log(String(y));
}
geek();

Output

true
false

Example 4: In this example, we will use the String function to return Date() object’s string value.

JavaScript

function geek() {
    let y = Date();
    console.log(String(y));        
}
geek()

Output

Mon Jul 15 2024 07:20:16 GMT+0000 (Coordinated Universal Time)

Supported Browsers:

Google Chrome 3
Microsoft Edge 12
Mozilla Firefox 3.0
Safari 5
Opera 10.5