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d01ab66b47
Reviewed By: sahrens Differential Revision: D7961488 fbshipit-source-id: 05f9b8b0b91ae77f9040a5321ccc18f7c3c1ce9a
29 lines
706 B
JavaScript
29 lines
706 B
JavaScript
/**
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* Copyright (c) 2015-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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* @format
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* @flow
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*/
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'use strict';
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function mapWithSeparator<TFrom, TTo>(
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items: Array<TFrom>,
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itemRenderer: (item: TFrom, index: number, items: Array<TFrom>) => TTo,
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spacerRenderer: (index: number) => TTo,
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): Array<TTo> {
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const mapped = [];
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if (items.length > 0) {
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mapped.push(itemRenderer(items[0], 0, items));
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for (let ii = 1; ii < items.length; ii++) {
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mapped.push(spacerRenderer(ii - 1), itemRenderer(items[ii], ii, items));
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}
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}
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return mapped;
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}
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module.exports = mapWithSeparator;
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