mirror of
https://github.com/shaka-project/shaka-player.git
synced 2026-06-15 16:06:41 +03:00
Jacob Trimble
f70436540c
This is part of a change to convert all usages of 'var' with either 'let' or 'const'. This takes a conservative approach for 'const' where it will only be used for aliases and storing the "original" values in tests. Change-Id: I10f5c38a8b06b5797c6eec7492829084114514c9
95 lines
2.3 KiB
JavaScript
95 lines
2.3 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.MapUtils');
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/**
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* @namespace shaka.util.MapUtils
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* @summary A set of map/object utility functions.
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*/
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/**
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* Returns true if the map is empty; otherwise, returns false.
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*
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* @param {Object.<KEY, VALUE>} object
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* @return {boolean}
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* @template KEY,VALUE
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*/
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shaka.util.MapUtils.empty = function(object) {
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return !object || Object.keys(object).length == 0;
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};
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/**
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* Gets the map's values.
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*
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* @param {!Object.<KEY, VALUE>} object
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* @return {!Array.<VALUE>}
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* @template KEY,VALUE
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*/
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shaka.util.MapUtils.values = function(object) {
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return Object.keys(object).map(function(key) { return object[key]; });
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};
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/**
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* Converts the values in the given Map to a different value.
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*
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* @param {!Object.<KEY, VALUE>} object
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* @param {function(VALUE, KEY=):OUTPUT} callback
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* @return {!Object.<KEY, OUTPUT>}
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* @template KEY,VALUE,OUTPUT
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*/
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shaka.util.MapUtils.map = function(object, callback) {
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return Object.keys(object).reduce(function(ret, key) {
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let value = object[key];
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ret[key] = callback(value, key);
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return ret;
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}, {});
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};
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/**
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* Returns true if every entry matches the predicate.
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*
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* @param {!Object.<KEY, VALUE>} object
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* @param {function(KEY, VALUE):boolean} callback
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* @return {boolean}
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* @template KEY,VALUE
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*/
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shaka.util.MapUtils.every = function(object, callback) {
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return Object.keys(object).every(function(key) {
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return callback(key, object[key]);
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});
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};
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/**
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* Invokes the callback for each entry in the map.
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*
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* @param {!Object.<KEY, VALUE>} object
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* @param {function(KEY, VALUE)} callback
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* @template KEY,VALUE
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*/
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shaka.util.MapUtils.forEach = function(object, callback) {
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Object.keys(object).forEach(function(key) {
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callback(key, object[key]);
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});
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};
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