如何轻松增加地图内某个键的值

Question

If I use object literal as a map, I can simply do: obj[key]++ , but for a map created through new Map , right now I had to do the follows:

let currentVal = myMap.get(key);
myMap.set(currentVal + 1);

Which is a lot of typing and no where near elegant. I read up on MDN: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map but there doesn't seem to be an example that covers my use case.

Answer 1

A lot of times if you're storing primitives in the map you're kind of doing it wrong anyway. A lot of times you want to associate that value with other properties. In any event, while it's a little more overhead, you can simplify it by storing an Object instead of primitive.

myMap.set({ value: initialValue });

// later
myMap.get(key).value++;