javascript - How to initialize a Map in ES6/ES2015 similar to an Object expression?

Question

What is the equivalent of

var object = {
  'foo': 'bar',
  1: 42
}

using an ES6 Map?

question from:https://stackoverflow.com/questions/32877552/how-to-initialize-a-map-in-es6-es2015-similar-to-an-object-expression

Answer 1

The closest you can get is:

let object = new Map([
  ['foo', 'bar'],
  ['1', 42]
]);

Important things to notice:

1. Object properties are identified by strings, while Map keys can be any value, so make sure all keys are strings in the input array.
2. Iterating a Map object yields entries by insertion order. That is not guaranteed for objects, so behavior might be different.