How Do I Copy a Map into a Duplicate Map? [duplicate]
With the introduction of Maps in JavaScript it's quite simple considering the constructor accepts an iterable:
var newMap = new Map(existingMap)Documentation here: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map
A simple way (to do a shallow copy) is to copy each property of the source map to the target map:
var newMap = {};for (var i in myMap) newMap[i] = myMap[i];NOTE: newMap[i] could very well be a reference to the same object as myMap[i]
Very simple to clone a map since what you're talking about is just an object. There is a Map in ES6 that you should look up, but to copy an object, just use Object.assign()
let map = {"a": 1, "b": 2}let copy = Object.assign({}, map);You can also use cloneDeep() from Lodash
let copy = cloneDeep(map);