JS: Object.fromEntries (Iterable to Object)

By Xah Lee. Date: . Last updated: .

New in JS2019.

Object.fromEntries(iterableX)
Convert iterableX to data object. Return a object with key value pairs from Iterable Object iterableX. The iterableX must have pairs as element, such as nested array, or map. 〔see the Map Object Tutorial〕 
// convert nested array of tuple to object
const aa = [["a", 3], ["b", 4]];
const jj = Object.fromEntries(aa);
console.log(jj);
// { a: 3, b: 4 }

// convert map to object
const xx = new Map([["a", 3], ["b", 4]]);
const jj = Object.fromEntries(xx);
console.log(jj);
// { a: 3, b: 4 }