r1C7GBbe

1function emailSort(a, b) {
2    const importance = {"gmail.com": 1, "yahoo.com": 2, "rocketmail.com": 3, "ymail.com": 4};
3
4    const importanceOfA = importance[a.split('@')[1]];
5    const importanceOfB = importance[b.split('@')[1]];
6
7    if (importanceOfA && !importanceOfB) return -1;
8    if (importanceOfB && !importanceOfA) return 1;
9    if (importanceOfA && importanceOfB) return importanceOfA - importanceOfB;
10
11    return 0;
12}
13
14arra = [
15    "juni1@rocketmail.com",
16    "juni2@rocketmail.com",
17    "juni3@rocketmail.com",
18    "juni1@yahoo.com",
19    "juni2@yahoo.com",
20    "juni3@yahoo.com",
21    "juni1@ymail.com",
22    "juni3@ymail.com",
23    "juni2@ymail.com",
24    "juni1@gmail.com",
25    "junaid4567@gmail.com",
26    "juni4@gmail.com",
27]
28newArray = arra.sort(emailSort);
29console.log(newArray)
30//will return
31// [ 'juni4@gmail.com', 
32//   'junaid4567@gmail.com', 
33//   'juni1@gmail.com', 
34//   'juni1@yahoo.com', 
35//   'juni2@yahoo.com', 
36//   'juni3@yahoo.com', 
37//   'juni2@rocketmail.com', 
38//   'juni3@rocketmail.com', 
39//   'juni1@rocketmail.com', 
40//   'juni2@ymail.com', 
41//   'juni3@ymail.com', 
42//   'juni1@ymail.com' ]