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/** * Copyright (c) 2013-present, Facebook, Inc. * * This source code is licensed under the MIT license found in the * LICENSE file in the root directory of this source tree. * * @providesModule partitionArray * @typechecks * @flow */ /** * Partitions an array given a predicate. All elements satisfying the predicate * are part of the first returned array, and all elements that don't are in the * second. */ function partitionArray<Tv>(array: Array<Tv>, predicate: (value: Tv, index: number, array: Array<Tv>) => boolean, context?: any): [Array<Tv>, Array<Tv>] { var first = []; var second = []; array.forEach((element, index) => { if (predicate.call(context, element, index, array)) { first.push(element); } else { second.push(element); } }); return [first, second]; } module.exports = partitionArray;