-
Notifications
You must be signed in to change notification settings - Fork 4
/
equal.ts
67 lines (54 loc) · 1.89 KB
/
equal.ts
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
/**
* 检查两个对象是否相等
* @param a
* @param b
*/
function equal(a: any, b: any): boolean {
if (a === b) return true;
if (a && b && typeof a == 'object' && typeof b == 'object') {
if (a.constructor !== b.constructor) return false;
let length, i, keys;
if (Array.isArray(a)) {
length = a.length;
if (length !== b.length) return false;
for (i = length; i-- !== 0; ) if (!equal(a[i], b[i])) return false;
return true;
}
if (a instanceof Map && b instanceof Map) {
if (a.size !== b.size) return false;
for (i of a.entries()) if (!b.has(i[0])) return false;
for (i of a.entries()) if (!equal(i[1], b.get(i[0]))) return false;
return true;
}
if (a instanceof Set && b instanceof Set) {
if (a.size !== b.size) return false;
for (i of a.entries()) if (!b.has(i[0])) return false;
return true;
}
if (ArrayBuffer.isView(a) && ArrayBuffer.isView(b)) {
// @ts-ignore
length = a.length;
// @ts-ignore
if (length !== b.length) return false;
for (i = length; i-- !== 0; ) if (a[i] !== b[i]) return false;
return true;
}
if (a.constructor === RegExp) return a.source === b.source && a.flags === b.flags;
if (a.valueOf !== Object.prototype.valueOf) return a.valueOf() === b.valueOf();
if (a.toString !== Object.prototype.toString) return a.toString() === b.toString();
// eslint-disable-next-line prefer-const
keys = Object.keys(a);
length = keys.length;
if (length !== Object.keys(b).length) return false;
for (i = length; i-- !== 0; )
if (!Object.prototype.hasOwnProperty.call(b, keys[i])) return false;
for (i = length; i-- !== 0; ) {
const key = keys[i];
if (!equal(a[key], b[key])) return false;
}
return true;
}
// eslint-disable-next-line no-self-compare
return a !== a && b !== b;
}
export default equal;