JavaScript Generator() Constructor

Last Updated : 02 Jun, 2023

In JavaScript, there is no particular Generator() constructor but instead, we can use generator function declaration to construct a Generator object which is iterable as the Generator object is a subclass of the Iterable class. Generators are usually used to create functions that can be exited and re-entered.

Syntax:

function* gen(){     // Sample Code } let example = gen();

Example 1: This example creates a generator object.

JavaScript

function* gen(){         let i = "a"         yield i;         yield i+"b";     }      let example  = gen();  console.log(typeof(example)) console.log(example.next().value); console.log(example.next().value);

Output: When we check the type of example we get the object as output as there is no inbuilt Generator object

object a ab

Example 2: This example creates an infinite generator object.

JavaScript

function* gen(){     let i = 123     while(true){         yield i++;     } }  let example  = gen();  for(let i = 0; i<5; i++) {     console.log(example.next().value);     }

Output: We can iterate this generator function as much as we want as it will always remain true.

123 124 125 126 127

Supported Browsers:

Chrome
Edge
Firefox
Opera
Safari

We have a complete list of JavaScript Generator methods, to check those please go through, the JavaScript Generator Reference article

JavaScript Generator constructor Property

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JavaScript Generator() Constructor

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