react.js (1451B)
1 'use strict'; 2 3 // do not edit .js files directly - edit src/index.jst 4 5 6 7 module.exports = function equal(a, b) { 8 if (a === b) return true; 9 10 if (a && b && typeof a == 'object' && typeof b == 'object') { 11 if (a.constructor !== b.constructor) return false; 12 13 var length, i, keys; 14 if (Array.isArray(a)) { 15 length = a.length; 16 if (length != b.length) return false; 17 for (i = length; i-- !== 0;) 18 if (!equal(a[i], b[i])) return false; 19 return true; 20 } 21 22 23 24 if (a.constructor === RegExp) return a.source === b.source && a.flags === b.flags; 25 if (a.valueOf !== Object.prototype.valueOf) return a.valueOf() === b.valueOf(); 26 if (a.toString !== Object.prototype.toString) return a.toString() === b.toString(); 27 28 keys = Object.keys(a); 29 length = keys.length; 30 if (length !== Object.keys(b).length) return false; 31 32 for (i = length; i-- !== 0;) 33 if (!Object.prototype.hasOwnProperty.call(b, keys[i])) return false; 34 35 for (i = length; i-- !== 0;) { 36 var key = keys[i]; 37 38 if (key === '_owner' && a.$$typeof) { 39 // React-specific: avoid traversing React elements' _owner. 40 // _owner contains circular references 41 // and is not needed when comparing the actual elements (and not their owners) 42 continue; 43 } 44 45 if (!equal(a[key], b[key])) return false; 46 } 47 48 return true; 49 } 50 51 // true if both NaN, false otherwise 52 return a!==a && b!==b; 53 };