JavaScript Array.from function - 60 minutes study

June 30, 2016

Array.from study: 

https://msdn.microsoft.com/en-us/library/k4h76zbx(v=vs.94).aspx


two concepts: 
1. array-like object, an iterable object. 

Array.from 
syntax: Array.from(arrayLike[,mapfn [,thisArg]]); 

Array-like object:
http://stackoverflow.com/questions/11886578/creating-array-like-objects-in-javascript

Iterable object:
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Iterators_and_Generators

JavaScript String, Array, TypedArray, Map and Set are all built-in iterables.

Read JavaScript Map
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map