ts-prime/dist/commonjs/uniqBy.d.ts

A utility library for JavaScript and Typescript.

/**
 * Returns a new array containing only one copy of each element in the original list transformed by a function.
 * Elements are compared by reference using Set.
 * @param array - List of items
 * @signature
 *    P.uniqBy(fn, array)
 * @signature
 *    P.pipe(array, P.uniqBy(fn))
 * @example
 *    P.uniq(obj => obj.n, [{n: 1}, {n: 2}, {n: 2}, {n: 5}, {n: 1}, {n: 6}, {n: 7}]) // => [{n: 1}, {n: 2}, {n: 5}, {n: 6}, {n: 7}]
 *    P.pipe(
 *      [{n: 1}, {n: 2}, {n: 2}, {n: 5}, {n: 1}, {n: 6}, {n: 7}], // only 4 iterations
 *      P.uniq(obj => obj.n),
 *      P.take(3)
 *    ) // => [{n: 1}, {n: 2}, {n: 5}]
 * @category Array, Pipe
 */
export declare function uniqBy<T, K>(array: readonly T[], transformer: (item: T) => K): T[];
export declare function uniqBy<T, K>(transformer: (item: T) => K): (array: readonly T[]) => T[];
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