22 lines
No EOL
953 B
TypeScript
22 lines
No EOL
953 B
TypeScript
//#region src/fp/array/unionBy.d.ts
|
|
/**
|
|
* Creates a function that returns unique values by mapped identity.
|
|
*
|
|
* Values from the piped array are considered before values from secondArray. The mapper
|
|
* is used to compare identities, matching the main {@link unionBy} behavior.
|
|
*
|
|
* @template T - The type of elements in the arrays.
|
|
* @template U - The type of comparison keys returned by the mapper.
|
|
* @param secondArray - Values to include after the piped array.
|
|
* @param mapper - Called for values from both arrays to produce comparison keys.
|
|
* @returns A function that maps a readonly array to its union with secondArray.
|
|
*
|
|
* @example
|
|
* import { pipe, unionBy } from 'es-toolkit/fp';
|
|
*
|
|
* pipe([{ id: 1 }], unionBy([{ id: 1 }, { id: 2 }], item => item.id));
|
|
* // => [{ id: 1 }, { id: 2 }]
|
|
*/
|
|
declare function unionBy<T, U>(secondArray: readonly T[], mapper: (item: T) => U): (array: readonly T[]) => T[];
|
|
//#endregion
|
|
export { unionBy }; |