JavaScript concat two Map objects [duplicate]

Question

Is there any way to concat two (or more) Map Objects to a Map like array concat?

var map1 = new Map([['breakfast', 'meal'], ['dinner', 'meal']]);
var map2 = new Map([['launch', 'meal'], ['dinner', 'meal']]);
var concatenated = map1.concat(map2);

Answer 1

The simplest way I found was to convert maps to key value pair array, concat them and finally create a new map from result:

var map1 = new Map([['breakfast', 'meal'], ['dinner', 'meal']]);
var map2 = new Map([['launch', 'meal'], ['dinner', 'meal']]);
var concatenated = new Map([...map1].concat([...map2]));