Function replace

Override a Map entry if an entry with the same key exists.

An optional oldValue can be provided, which has to match the current value inside the Map.

Mutation

Example

Override value if key exists

const map = new Map([[1, 2]]);
replace(map)(1, 3);
console.log(map); // Map([[1, 3]])

Example

Override value if current value matches old value

const map = new Map([[1, 2]]);
replace(map)(1, 2, 3);
console.log(map); // Map([[1, 3]])