object-keys-05.js (1134B)
1 // This test case is similar to object-keys-01, except that we replace 2 // `Object.keys` by a copy of it. 3 let myThis = { 4 keys: Object.keys 5 }; 6 7 // Similar functions are part of popular framework such as React and Angular. 8 function shallowEqual(o1, o2) { 9 var k1 = myThis.keys(o1); 10 var k2 = myThis.keys(o2); 11 if (k1.length != k2.length) { 12 return false; 13 } 14 for (var k = 0; k < k1.length; k++) { 15 if (!Object.hasOwnProperty.call(o2, k1[k]) || !Object.is(o1[k1[k]], o2[k1[k]])) { 16 return false; 17 } 18 } 19 return true; 20 } 21 22 let objs = [ 23 {x:0, a: 1, b: 2}, 24 {x:1, b: 1, c: 2}, 25 {x:2, c: 1, d: 2}, 26 {x:3, a: 1, b: 2, c: 3}, 27 {x:4, b: 1, c: 2, d: 3}, 28 {x:5, a: 1, b: 2, c: 3, d: 4} 29 ]; 30 31 with({}) {} 32 for (let i = 0; i < 1000; i++) { 33 for (let o1 of objs) { 34 for (let o2 of objs) { 35 assertEq(shallowEqual(o1, o2), Object.is(o1, o2)); 36 } 37 } 38 } 39 40 let count = 0; 41 myThis.keys = function keys(obj) { 42 count++; 43 return Object.keys(obj); 44 } 45 46 let o1 = objs[4], o2 = objs[5]; 47 assertEq(shallowEqual(o1, o2), Object.is(o1, o2)); 48 assertEq(count, 2);