Generators In JS

Generator function are defined with keyword function*

Let’s take below example

function createCounter() {
    let count = 0;
    // console.log("Counter Init");
    return function() {
        count++;
        // console.log("Return Count:", count);
        return count;
    }
}
let counter = createCounter();
console.log(counter()); // 1
console.log(counter()); // 2
console.log(counter()); // 3

Now there is another way to do the same using generator

function* createCounter() {
    let count = 0;
    while(true) {
        yield ++count;
    }
}
let counter = createCounter();
console.log(counter.next().value); //1
console.log(counter.next().value); //2
console.log(counter.next().value); //3

Reference

• Generator Function
• Iterators and generators