1. var database = [
2.     {
3.         username: "Rafnexx",
4.         password: "passw0rd"
5.     },
6.     {
7.         username: "admin",
8.         password: "haslo"
9.     },
10.     {
11.         username: "johny",
12.         password: "haslo"
13.     },
14.     {
15.         username: "mnemonic",
16.         password: "haslo"
17.     },
18.     {
19.         username: "tibia",
20.         password: "haslo"
21.     },
22.        
23. ];
24.  
25. var newsfeed = [
26.     {
27.         username: "John",
28.         timeline: "I'm tired!"
29.     },
30.     {
31.         username: "Szymon",
32.         timeline: "That's so exciting!"
33.     },
34.     {
35.         username: "Patryk",
36.         timeline: "Tomorrow, I'll destroy you guys!"
37.     }
38. ];
39.  
40. var userNamePrompt = prompt("What's your username?");
41. var passwordPrompt = prompt("What's your password?");
42.  
43. function checkingUserNameAndPassword(user, pass) {
44.         return database.some( name => name.username == user) &&  database.some( name => name.password == pass);
45. }
46.  
47.  
48. function signingIn() {
49.     checkingUserNameAndPassword(userNamePrompt, passwordPrompt) ? console.log(newsfeed) : console.log("Błędna nazwa użytkownika lub hasło!");
50.     }
51. }
52.  
53. signingIn();