Notes from Eric Rey (2018), "Iterators and Generators do have a place in modern JavaScript"

eric-rey-it-gen-examples.js

// 17 Oct 2019

// Notes from Eric Rey, "Iterators and Generators do have a place in modern JavaScript" (25 Aug 2018)
// https://itnext.io/iterators-and-generators-do-have-a-place-in-modern-javascript-d4cb589b491

// I LIKE THE FIRST USE
// Custom Collections

function EvenNumbers(values = []) {
  values = [...values];
  
  return {
    addElement(value) {
      values.push(value)
    },
    
    *[Symbol.iterator]() {
      for (value of values) {
        if (value % 2 == 0) {
          yield value;
        }
      }
    }
  }
}

var collection = EvenNumbers([1,2,3]);

collection.addElement(12);

var even = [...collection];

console.log(even);


// I DON'T LIKE THE NEXT EXAMPLE
// Async code that looks synchronous
// fetchData()

// there's something deeply wrong there I can't put my finger on it yet...

// 28 April 2020:  figured it out
// see gist, async-generator-example.js -> https://gist.github.com/dfkaye/83bd9455a9daa5c561d9295a80856bde