blog_generator.js

blog_generator.js

function* gen() { // new * syntax for declaring generator functions.
  yield 1 // yield says 'output the value and stop'.
  yield 2
}
// we use our generator to create an 'iterator': an object with a .next method.
const myIterator = gen()

// every time .next gets called, it returns an object that looks like: {value: ..., done: ...}
myIterator.next() //=> {value: 1, done: false}
myIterator.next() //=> {value: 2, done: false}
myIterator.next() //=> {value: 3, done: true}

// AND you can also pass stuff into it. 

function* gen() {
  const x = 1 + (yield ‘PAUSED!’);
  yield x
}

myIterator.next().value //=> PAUSED!
myIterator.next(2).value //=> 3