Function getMapKeyByValue

Finds the first key in a Map that corresponds to the specified value.

Returns

The first key whose value strictly equals (===) the searchValue, or undefined if no match is found.

Example

const myMap = new Map<string, number>([['a', 1], ['b', 2], ['c', 1]]);
getMapKeyByValue(myMap, 1); // → 'a'
getMapKeyByValue(myMap, 3); // → undefined

Remarks

• Only the first matching key is returned; subsequent keys with the same value are ignored.
• Comparison uses strict equality (===).