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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 | 1x 3x 1x 3x 3x 2x 1x | import { compute } from "./compute";
/**
* @mutation
*
* @example
* Set a {@link Map} entry if the key is present
* ```ts
* const map = new Map([[1, 2]]);
* computeIfPresent(map)(1, (key, value) => value + 1);
* console.log(map); // Map([[1, 3]])
* ```
*
* @typeParam K - the {@link Map} key type
* @typeParam V - the {@link Map} value type
* @param map - the {@link Map} to set the entry
*/
export const computeIfPresent =
<K, V>(map: Map<K, V>) =>
(
key: K,
remappingFunction: (key: K, value: V) => V | undefined
): V | undefined => {
if (map.has(key)) {
return compute(map)(key, remappingFunction);
}
return undefined;
};
|