Coding Cloud

Iterator Pattern (aka Custom Iterators)

JS
S
JavaScript

It's basically an object that KNOWS how to access items from a collection and if the iteration is finished or not. It's API consists on a next() method that returns the next item 

1function createIterator(array) {
2  let nextIndex = 0;
3  return {
4    next: function(){
5      return nextIndex < array.length ?
6        { value: array[nextIndex++], done: false } :
7        { done: true}
8    }
9  }
10}
11
12const myIt = createIterator(['code','recipes']);
13console.log(myIt.next().value);
14console.log(myIt.next().value);
15console.log(myIt.next().done);

Created on 2/28/2018