ES6 Tutorial - #7 Iterating Objects & Arrays

01:08 for...in loop 03:09 for...in traverses the prototype chain 04:38 Object.keys() & Array.forEach() - ES5 07:20 for...of (ES6) doesn't iterate plain objects 08:20 for...of works with Object.keys() 09:12 jQuery, Underscore, and Lodash 10:44, 11:52 Do NOT use for...in with arrays 14:41 for loop 15:19 Caching the condition 16:28 for loop is imperative (HOW to loop) 17:17 forEach method - ES5 18:56 forEach is declarative (WHAT to loop) 20:02 map method - ES5 22:41 forEach is best for simple iterations with no side effects; map - for processing elements in a functional manner without mutating the original array 23:30 for...of loop - ES6 24:23 for...of does not give access to the indexes 25:02 Alternatives for iterating arrays This next one is more of a review of pre-ES6 approaches to iterating (aka looping) through objects and arrays. We'll look over for...in, for, forEach, map, as well as the new for...of loop, and a few others. The key takeaway is to stick with for...in when enumerating plain objects, and use either forEach or for...of with array-like objects. Deep dive into iterables & iterators https://medium.freecodecamp.org/demystifying-es6-iterables-iterators-4bdd0b084082 How to not get caught in the trap of array-like objects http://www.nfriedly.com/techblog/2009/06/advanced-javascript-objects-arrays-and-array-like-objects/ Imperative vs Declarative programming https://tylermcginnis.com/imperative-vs-declarative-programming/

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