generator-insights.js

function* myGeneratorFunction(){
    console.log("Hello generator!")
    yield "Yield result one"

    console.log("Hello generator again!")
    yield "Yield result two"

    return "Generator is done"
}

const gen = myGeneratorFunction()

console.log("Calling next the first time")
const resultOne = gen.next();
console.log(resultOne);

console.log("Calling next the second time")
const resultTwo = gen.next();
console.log(resultTwo);

console.log("Calling next the third time")
const resultThree = gen.next();
console.log(resultThree);

console.log("Calling next the fourth time")
const resultFour = gen.next();
console.log(resultFour);

// Output:

// Calling next the first time
// Hello generator!
// { value: 'Yield result one', done: false }
// Calling next the second time
// Hello generator again!
// { value: 'Yield result two', done: false }
// Calling next the third time
// { value: 'Generator is done', done: true }
// Calling next the fourth time
// { value: undefined, done: true }