From the archive: this article was published in July 2016 and is kept for reference. Tools, versions and figures may have changed since.
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ES6 introduces many new features to embrace the developer as well as the browsers to perform in a optimal performant way.
Set
Set is new type of data structure that we can use to store Unique values which can be of any type but they must all be unique.
Create a Set
To create a set we use Set constructor var mySet = new Set();
Add Values to set
let myArray = [1, 4, 1, 5, 5, 7, 8, 9, 0, 0]
let mySet = new Set(myArray)
Now if you do a console.log(mySet); you will see
Set {1, 4, 5, 7, 8, 9, 0}
Map
Map is similar to Set but it manges key-value pair instead of individual values.
Create a Map
var myMap = new Map(); will create an instance of Map and to add values to it we can do let myOtherMap = new Map([['a', 2], [1, 'b']])
console.log(myOtherMap); will show Map {"a" => 2, 1 => "b"}
WeakSet and WeakMap
Similar to regular Map and Set but the difference is that the object references inside them are held weakly. So it wont prevent garbage collection.
This article originally appeared on lightrains.com
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