JavaScript: Map.prototype.set
New in JS2015.
map_obj.set(key, val)
Add a entry to the map map_obj . If the key already exist, overwrite its value.
Return the modified map.
// create a map const mp = new Map(); // add entry const returnValue = mp.set (3, "n3"); // the map is modified console.log( mp ); // Map { 3 => 'n3' } // return value is the modified map console.log( returnValue ); // Map { 3 => 'n3' }