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