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a96fcc7ce1
Summary: Update mapWithSeparator so that Flow can reason about the arguments and return type. For simplicity, it is expected that the type of the separator will be the same as that of the mapped item. Reviewed By: vjeux Differential Revision: D3323557 fbshipit-source-id: 75b59e928d4e8c309b5933499a14744370ee5660
30 lines
856 B
JavaScript
30 lines
856 B
JavaScript
/**
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* Copyright (c) 2015-present, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*
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* @providesModule mapWithSeparator
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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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