// Copyright 2019 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
/** @module common-sk/modules/object
* @description Utility functions for dealing with Objects.
*/
import { fromObject } from './query';
/** @method deepCopy
* @param object - The object to make a copy of.
*/
export function deepCopy(o) {
return JSON.parse(JSON.stringify(o));
}
/** Returns true if a and b are equal, covers Boolean, Number, String and Arrays and Objects.
*
* @param a The Hintable type object to compare.
* @param b The Hintable type object to compare.
*/
export function equals(a, b) {
if (typeof a !== typeof b) {
return false;
}
const ta = typeof a;
if (ta === 'string' || ta === 'boolean' || ta === 'number') {
return a === b;
}
if (ta === 'object') {
if (Array.isArray(a)) {
return JSON.stringify(a) === JSON.stringify(b);
}
return fromObject(a) === fromObject(b);
}
return false;
}
/** Returns an object with only values that are in o that are different from d.
*
* Only works shallowly, i.e. only diffs on the attributes of
* o and d, and only for the types that equals() supports.
*
* @example
* // Returns {a:2}
* getDelta({a:2, b:"foo"}, {a:1, b:"foo", c:3.14})
*
* @param {Object} o
* @param {Object} d
* @returns {Object}
*
*/
export function getDelta(o, d) {
const ret = {};
Object.keys(o).forEach((key) => {
if (!equals(o[key], d[key])) {
ret[key] = o[key];
}
});
return ret;
}
/** Returns a copy of object o with values from delta if they exist.
*
* @param {Object} delta - A delta object as returned from 'getDelta'.
* @param {Object} o
* @returns {Object}
*
*/
export function applyDelta(delta, o) {
const ret = {};
Object.keys(o).forEach((key) => {
if (delta.hasOwnProperty(key)) {
ret[key] = deepCopy(delta[key]);
}
else {
ret[key] = deepCopy(o[key]);
}
});
return ret;
}
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