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// This test case is similar to object-keys-01, except that we replace
// `Object.keys` by a copy of it.
let myThis = {
keys: Object.keys
};
// Similar functions are part of popular framework such as React and Angular.
function shallowEqual(o1, o2) {
var k1 = myThis.keys(o1);
var k2 = myThis.keys(o2);
if (k1.length != k2.length) {
return false;
}
for (var k = 0; k < k1.length; k++) {
if (!Object.hasOwnProperty.call(o2, k1[k]) || !Object.is(o1[k1[k]], o2[k1[k]])) {
return false;
}
}
return true;
}
let objs = [
{x:0, a: 1, b: 2},
{x:1, b: 1, c: 2},
{x:2, c: 1, d: 2},
{x:3, a: 1, b: 2, c: 3},
{x:4, b: 1, c: 2, d: 3},
{x:5, a: 1, b: 2, c: 3, d: 4}
];
with({}) {}
for (let i = 0; i < 1000; i++) {
for (let o1 of objs) {
for (let o2 of objs) {
assertEq(shallowEqual(o1, o2), Object.is(o1, o2));
}
}
}
let count = 0;
myThis.keys = function keys(obj) {
count++;
return Object.keys(obj);
}
let o1 = objs[4], o2 = objs[5];
assertEq(shallowEqual(o1, o2), Object.is(o1, o2));
assertEq(count, 2);
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