An ESnext spec-compliant Map
shim/polyfill/replacement that works as far down as ES3.
This package implements the es-shim API interface. It works in an ES3-supported environment and complies with the spec.
npm install --save es-map
var map = new Map();
var obj = {};
map.set(1, 2).set(obj, 4);
map.get(obj); // 4
map.has(3); // false
Simply clone the repo, npm install
, and run npm test