73 lines
2.3 KiB
TypeScript
73 lines
2.3 KiB
TypeScript
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/*
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Copyright (c) 2017 Evgeny Poberezkin
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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*/
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const isArray = Array.isArray;
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const keyList = Object.keys;
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const hasProp = Object.prototype.hasOwnProperty;
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function deepEquals(a: any, b: any): boolean {
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if (a === b) return true;
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if (a && b && typeof a == "object" && typeof b == "object") {
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const arrA = isArray(a);
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const arrB = isArray(b);
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let i;
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let length;
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let key;
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if (arrA && arrB) {
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length = a.length;
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if (length != b.length) return false;
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for (i = length; i-- !== 0; ) if (!deepEquals(a[i], b[i])) return false;
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return true;
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}
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if (arrA != arrB) return false;
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const dateA = a instanceof Date;
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const dateB = b instanceof Date;
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if (dateA != dateB) return false;
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if (dateA && dateB) return a.getTime() == b.getTime();
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const regexpA = a instanceof RegExp;
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const regexpB = b instanceof RegExp;
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if (regexpA != regexpB) return false;
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if (regexpA && regexpB) return a.toString() == b.toString();
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const keys = keyList(a);
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length = keys.length;
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if (length !== keyList(b).length) return false;
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for (i = length; i-- !== 0; ) if (!hasProp.call(b, keys[i])) return false;
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for (i = length; i-- !== 0; ) {
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key = keys[i];
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if (!deepEquals(a[key], b[key])) return false;
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}
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return true;
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}
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return a !== a && b !== b;
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}
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