@monstermann/fn/dist/array/countBy.d.ts

A utility library for TypeScript.

import { ArrayPredicate } from "./internals/types.js";

//#region src/array/countBy.d.ts

/**
 * `countBy(target, predicate)`
 *
 * Counts the number of elements in the `target` array satisfy the provided `predicate` function.
 *
 * ```ts
 * const isEven = (n) => n % 2 === 0;
 * countBy([1, 2, 3, 4, 5], isEven); // 2
 * ```
 *
 * ```ts
 * const isEven = (n) => n % 2 === 0;
 * pipe([1, 2, 3, 4, 5], countBy(isEven)); // 2
 * ```
 */
declare const countBy: {
  <T>(predicate: ArrayPredicate<T>): (target: readonly T[]) => number;
  <T>(target: readonly T[], predicate: ArrayPredicate<T>): number;
};
//#endregion
export { countBy };