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77 lines
2.0 KiB
77 lines
2.0 KiB
9 months ago
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/**
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* @license
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* Cesium - https://github.com/CesiumGS/cesium
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* Version 1.99
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*
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* Copyright 2011-2022 Cesium Contributors
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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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* Columbus View (Pat. Pend.)
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*
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* Portions licensed separately.
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* See https://github.com/CesiumGS/cesium/blob/main/LICENSE.md for full licensing details.
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*/
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define(['exports'], (function (exports) { 'use strict';
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/**
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* @function
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*
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* @param {*} value The object.
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* @returns {Boolean} Returns true if the object is defined, returns false otherwise.
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*
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* @example
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* if (Cesium.defined(positions)) {
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* doSomething();
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* } else {
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* doSomethingElse();
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* }
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*/
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function defined(value) {
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return value !== undefined && value !== null;
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}
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/**
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* Returns the first parameter if not undefined, otherwise the second parameter.
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* Useful for setting a default value for a parameter.
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*
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* @function
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*
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* @param {*} a
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* @param {*} b
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* @returns {*} Returns the first parameter if not undefined, otherwise the second parameter.
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*
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* @example
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* param = Cesium.defaultValue(param, 'default');
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*/
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function defaultValue(a, b) {
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if (a !== undefined && a !== null) {
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return a;
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}
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return b;
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}
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/**
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* A frozen empty object that can be used as the default value for options passed as
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* an object literal.
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* @type {Object}
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* @memberof defaultValue
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*/
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defaultValue.EMPTY_OBJECT = Object.freeze({});
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exports.defaultValue = defaultValue;
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exports.defined = defined;
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}));
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