mirror of
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90 lines
2.4 KiB
JavaScript
90 lines
2.4 KiB
JavaScript
/**
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* @license
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* Copyright 2019 Google LLC
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* SPDX-License-Identifier: Apache-2.0
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*/
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/**
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* @fileoverview Utility methods for objects.
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* @author samelh@google.com (Sam El-Husseini)
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*/
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'use strict';
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/**
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* @name Blockly.utils.object
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* @namespace
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*/
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goog.module('Blockly.utils.object');
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goog.module.declareLegacyNamespace();
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/**
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* Inherit the prototype methods from one constructor into another.
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* @param {!Function} childCtor Child class.
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* @param {!Function} parentCtor Parent class.
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* @suppress {strictMissingProperties} superClass_ is not defined on Function.
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*/
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const inherits = function(childCtor, parentCtor) {
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// Set a .superClass_ property so that methods can call parent methods
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// without hard-coding the parent class name.
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// Could be replaced by ES6's super().
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childCtor.superClass_ = parentCtor.prototype;
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// Link the child class to the parent class so that static methods inherit.
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Object.setPrototypeOf(childCtor, parentCtor);
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// Replace the child constructor's prototype object with an instance
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// of the parent class.
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childCtor.prototype = Object.create(parentCtor.prototype);
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childCtor.prototype.constructor = childCtor;
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// Alternatively, one could use this instead:
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// Object.setPrototypeOf(childCtor.prototype, parentCtor.prototype);
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};
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exports.inherits = inherits;
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/**
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* Copies all the members of a source object to a target object.
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* @param {!Object} target Target.
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* @param {!Object} source Source.
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*/
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const mixin = function(target, source) {
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for (const x in source) {
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target[x] = source[x];
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}
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};
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exports.mixin = mixin;
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/**
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* Complete a deep merge of all members of a source object with a target object.
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* @param {!Object} target Target.
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* @param {!Object} source Source.
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* @return {!Object} The resulting object.
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*/
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const deepMerge = function(target, source) {
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for (const x in source) {
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if (source[x] != null && typeof source[x] === 'object') {
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target[x] = deepMerge(target[x] || Object.create(null), source[x]);
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} else {
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target[x] = source[x];
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}
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}
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return target;
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};
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exports.deepMerge = deepMerge;
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/**
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* Returns an array of a given object's own enumerable property values.
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* @param {!Object} obj Object containing values.
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* @return {!Array} Array of values.
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*/
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const values = function(obj) {
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if (Object.values) {
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return Object.values(obj);
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}
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// Fallback for IE.
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return Object.keys(obj).map(function(e) {
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return obj[e];
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});
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};
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exports.values = values;
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