How to remove a value from a map in typescript

Question

I have myMap: { [key: string]: string[] } = {} and I want to remove a value for some certain key from myMap.

That is delete value1 from myMap[Key1].

I have done my google search but I failed to find it.

Answer 1

You can either remove both key and value:

myMap.delete(key);

Or reassign the value to undefined:

myMap.set(key, undefined);

_{Do note the first solution comes up with a Google search of javascript map delete value}

Answer 2

You can do it in two ways:

1. By using delete (mutation)

delete myMap[Key1]

2. By using object destructuring (no mutation), however note that a possibly unwanted variable _ will be created.

const {[Key1]: _, ...updatedMyMap} = myMap