JavaScript - Map() increment value

Question

I have a map as follows:

let map = new Map();
map.set(\"a\", 1);
//Map is now {\'a\' => 1}

I want to change the value of a

Answer 1

Map#get returns the value of the specified element. It is opposite of an object accessor (object['a']) and is not eligible for a left-hand side assignment.

The conclusion is to use always Map#set for setting a new value.