34 lines
1.0 KiB
JavaScript
34 lines
1.0 KiB
JavaScript
"use strict";
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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exports.default = promiseReduce;
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var _isPromise = _interopRequireDefault(require("./isPromise"));
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function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
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/**
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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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* strict
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*/
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/**
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* Similar to Array.prototype.reduce(), however the reducing callback may return
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* a Promise, in which case reduction will continue after each promise resolves.
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*
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* If the callback does not return a Promise, then this function will also not
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* return a Promise.
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*/
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function promiseReduce(values, callback, initialValue) {
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return values.reduce(function (previous, value) {
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return (0, _isPromise.default)(previous) ? previous.then(function (resolved) {
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return callback(resolved, value);
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}) : callback(previous, value);
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}, initialValue);
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} |