mirror of
https://github.com/shaka-project/shaka-player.git
synced 2026-06-15 16:06:41 +03:00
Jacob Trimble
47daf49f31
This is an automated change to convert use of "function" functions to arrow functions. This doesn't change all uses of bind() that could be converted. This also doesn't remove all "function" functions. Change-Id: I40ac7d086bcef947a1be083359c8fd1d4499a9c3
76 lines
1.9 KiB
JavaScript
76 lines
1.9 KiB
JavaScript
/**
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* @license
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* Copyright 2016 Google Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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goog.provide('shaka.util.Functional');
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/**
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* @namespace shaka.util.Functional
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* @summary A set of functional utility functions.
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*/
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/**
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* Creates a promise chain that calls the given callback for each element in
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* the array in a catch of a promise.
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*
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* e.g.:
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* Promise.reject().catch(callback(array[0])).catch(callback(array[1]));
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*
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* @param {!Array.<ELEM>} array
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* @param {function(ELEM):!Promise.<RESULT>} callback
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* @return {!Promise.<RESULT>}
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* @template ELEM,RESULT
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*/
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shaka.util.Functional.createFallbackPromiseChain = function(array, callback) {
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return array.reduce(((callback, promise, elem) => {
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return promise.catch(callback.bind(null, elem));
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}).bind(null, callback), Promise.reject());
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};
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/**
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* Returns the first array concatenated to the second; used to collapse an
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* array of arrays into a single array.
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*
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* @param {!Array.<T>} all
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* @param {!Array.<T>} part
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* @return {!Array.<T>}
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* @template T
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*/
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shaka.util.Functional.collapseArrays = function(all, part) {
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return all.concat(part);
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};
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/**
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* A no-op function. Useful in promise chains.
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*/
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shaka.util.Functional.noop = function() {};
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/**
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* Returns if the given value is not null; useful for filtering out null values.
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*
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* @param {T} value
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* @return {boolean}
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* @template T
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*/
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shaka.util.Functional.isNotNull = function(value) {
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return value != null;
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};
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