rhodash/dist/countBy.d.ts

A deadly simple alternative to lodash

/**
 * Count the number of elements that match a given condition.
 *
 * @example countBy([1, 2, 3, 4, 5], (x) => x % 2 === 0) // => 2
 */
export declare function countBy<T>(array: readonly T[], predicate: (arg: T) => boolean): number;
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