mirror of
https://github.com/shaka-project/shaka-player.git
synced 2026-06-15 16:06:41 +03:00
Joey Parrish
defc851283
The isEqualFunc and isNotEqualFunc methods in shaka.util.Functional are no longer needed. This removes the last two calls to isNotEqualFunc. There were no calls to isEqualFunc. Both utility methods can now be dropped. Change-Id: I9d4de215527982951e84162947ad9b17831eaf44
93 lines
2.4 KiB
JavaScript
93 lines
2.4 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(function(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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/**
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* Used to filter out duplicates in an array.
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* Returns true the first time the element is encountered. Returns false
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* for all the subsequent encounters.
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*
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* @param {T} item
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* @param {number} position
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* @param {!Array.<T>} self
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* @return {boolean}
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* @template T
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* @example [1, 1, 2].filter(shaka.util.Functional.isNotDuplicate) -> [1, 2]
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*/
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shaka.util.Functional.isNotDuplicate = function(item, position, self) {
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return self.indexOf(item) == position;
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};
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