82 lines
2 KiB
JavaScript
82 lines
2 KiB
JavaScript
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/*
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* Copyright 2022 Sangoma Technologies Corporation
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* Kevin Harwell <kharwell@sangoma.com>
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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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/**
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* Checks to see if given objects are equal.
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*
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* @param {Object} obj1
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* @param {Object} obj2
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* @param {requestCallback} [eq] - Object equality callback
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* @return {string} A comma separated string of language names.
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*/
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function equals(obj1, obj2, eq) {
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if (obj1 == undefined || obj1 == null ||
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obj2 == undefined || obj2 == null) {
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return false;
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}
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return obj1 == obj2 || (eq && eq(obj1, obj2));
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}
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/**
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* Creates a list of objects that contains only those objects that are equal between
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* the given lists of objects.
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*
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* @param {Object[]} objs1
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* @param {Object[]} objs2
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* @param {requestCallback} [eq] - Object equality callback
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* @return {Object[]} An intersected list of objects.
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*/
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function intersect(objs1, objs2, eq) {
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let res = [];
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for (let obj1 of objs1) {
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for (let obj2 of objs2) {
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if (equals(obj1, obj2, eq)) {
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res.push(obj1);
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}
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}
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}
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return res;
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}
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/**
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* Finds and returns the first matching object within two given lists.
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*
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* @param {Object[]} objs1
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* @param {Object[]} objs2
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* @param {requestCallback} [eq] - Object equality callback
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* @return {Object} The first matching object.
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*/
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function first(objs1, objs2, eq) {
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if (!Array.isArray(objs1)) {
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objs1 = [objs1];
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}
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if (!Array.isArray(objs2)) {
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objs2 = [objs2];
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}
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return intersect(objs1, objs2, eq)[0];
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}
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module.exports = {
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first,
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intersect,
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}
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