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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
