JavaScript Generator() Constructor

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.

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.

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