ES Ideas I want to propose / like

es_ideas.md

Array Update

Acts like objects but uses indeces as keys

const array = [ 1, 2, 3 ]
const newArray = [...array, 4: 5 ]

Iterable & Mapping Literals

Acts like template functions

const set = Set [ 1, 2, 3 ]
const map = Map { 1: 2, 3: 4, 5: 6 }