39 lines
1.2 KiB
JavaScript
39 lines
1.2 KiB
JavaScript
|
//#region src/map/mapKeys.ts
|
||
|
|
/**
|
||
|
|
* Creates a new Map with the same values but with keys transformed by the provided function.
|
||
|
|
*
|
||
|
|
* This function takes a Map and a function that generates a new key from each value-key pair.
|
||
|
|
* It returns a new Map where the keys are the result of applying the function to each entry,
|
||
|
|
* while the values remain the same.
|
||
|
|
*
|
||
|
|
* @template K - The type of keys in the Map.
|
||
|
|
* @template V - The type of values in the Map.
|
||
|
|
* @param {Map<K, V>} map - The Map to transform.
|
||
|
|
* @param {(value: V, key: K, object: Map<K, V>) => K} getNewKey - A function that generates a new key from a value-key pair.
|
||
|
|
* @returns {Map<K, V>} A new Map with transformed keys and the same values.
|
||
|
|
*
|
||
|
|
* @example
|
||
|
|
* const map = new Map([
|
||
|
|
* ['a', 1],
|
||
|
|
* ['b', 2],
|
||
|
|
* ['c', 3]
|
||
|
|
* ]);
|
||
|
|
* const result = mapKeys(map, (value, key) => key.toUpperCase());
|
||
|
|
* // result will be:
|
||
|
|
* // Map(3) {
|
||
|
|
* // 'A' => 1,
|
||
|
|
* // 'B' => 2,
|
||
|
|
* // 'C' => 3
|
||
|
|
* // }
|
||
|
|
*/
|
||
|
|
function mapKeys(map, getNewKey) {
|
||
|
|
const result = /* @__PURE__ */ new Map();
|
||
|
|
for (const [key, value] of map) {
|
||
|
|
const newKey = getNewKey(value, key, map);
|
||
|
|
result.set(newKey, value);
|
||
|
|
}
|
||
|
|
return result;
|
||
|
|
}
|
||
|
|
//#endregion
|
||
|
|
export { mapKeys };
|