ncatalin
3/10/2018 - 2:50 PM

Iterators & Generators

Modern JavaScript From The Beginning from Brad Traversy

index.html
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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>JavaScript Sandbox</title>
</head>
<body>
  
  <script src="app.js"></script>
</body>
</html>
app.js
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// Iterator Example
// function nameIterator(names) {
//   let nextIndex = 0;

//   return {
//     next: function() {
//       return nextIndex < names.length ?
//       { value: names[nextIndex++], done: false } :
//       { done: true }
//     }
//   }
// }

// // Create an array of names
// const namesArr = ['Jack', 'Jill', 'John'];
// // Init iterator and pass in the names array
// const names = nameIterator(namesArr);

// console.log(names.next().value);
// console.log(names.next().value);
// console.log(names.next().value);
// console.log(names.next().value);

// Generator Example
// function* sayNames() {
//   yield 'Jack';
//   yield 'Jill';
//   yield 'John';
// }

// const name = sayNames();

// console.log(name.next().value);
// console.log(name.next().value);
// console.log(name.next().value);
// console.log(name.next().value);

// ID Creator
function* createIds() {
  let index = 1;

  while(true) {
    yield index++;
  }
}

const gen = createIds();

console.log(gen.next().value);
console.log(gen.next().value);
console.log(gen.next().value);
console.log(gen.next().value);
console.log(gen.next().value);
console.log(gen.next().value);