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post.js

function* generatorFunction() {
       yield 'First value';
       yield 'Second value';
       return 'Third value';
    } 
    const iteratorObject = generatorFunction();     
    console.log(iteratorObject.next()) //{value: "First value", done: false}
    console.log(iteratorObject.next()) //{value: "Second value", done: false}
    console.log(iteratorObject.next()) // {value: "Third value", done: true}
    console.log(iteratorObject.next()) // {value: "undefined, done: true}