1. function demo(arr) {
2.   let array = arr;
3.  
4.   let equimpents = array.slice(0, 1);
5.  
6.   let arrOfEquipments = equimpents.toString().split(" ");
7.  
8.   let newArrOfCommands = array.splice(1);
9.  
10.   let lengthOfCommands = newArrOfCommands.length;
11.  
12.   let lengthOfEquipments = arrOfEquipments.length;
13.  
14.   for (let i = 0; i < lengthOfCommands; i++) {
15.     let currentElement = "";
16.  
17.     currentElement = newArrOfCommands.splice(0, 1).toString().split(" ");
18.  
19.     let command = "";
20.  
21.     command = currentElement[0];
22.  
23.     lengthOfEquipments = arrOfEquipments.length;
24.  
25.     if (command == "Buy") {
26.       let product = "";
27.  
28.       product = currentElement[1];
29.  
30.       arrOfEquipments.push(product);
31.     } else if (command == "Trash") {
32.       let productToDelete = "";
33.  
34.       productToDelete = currentElement[1];
35.  
36.       for (let j = 0; j < lengthOfEquipments; j++) {
37.         let weapon = "";
38.  
39.         weapon = arrOfEquipments[j];
40.  
41.         if (weapon == productToDelete) {
42.           arrOfEquipments.splice(j, 1);
43.         }
44.       }
45.     } else if (command == "Repair") {
46.       let weaponForRepair = "";
47.  
48.       weaponForRepair = currentElement[1];
49.  
50.       for (let k = 0; k < lengthOfEquipments; k++) {
51.         let weapon = "";
52.  
53.         weapon = arrOfEquipments[k];
54.  
55.         if (weapon == weaponForRepair) {
56.           let elementForRemove = arrOfEquipments.splice(k, 1).toString();
57.  
58.           arrOfEquipments.push(elementForRemove);
59.         }
60.       }
61.     } else if (command == "Upgrade") {
62.       let weapon = currentElement[1].toString();
63.  
64.       let currentWeapon = "";
65.  
66.       let upgrade = "";
67.  
68.       for (let y = 0; y < weapon.length - 1; y++) {
69.         let letter = "";
70.  
71.         letter = weapon[y];
72.  
73.         if (letter == "-") {
74.           for (let a = y + 1; a <= weapon.length - 1; a++) {
75.             let lettersForUpgrade = "";
76.             lettersForUpgrade = weapon[a];
77.             upgrade += lettersForUpgrade;
78.             y = a;
79.           }
80.         } else {
81.           currentWeapon += letter;
82.         }
83.       }
84.  
85.       for (let r = 0; r < lengthOfEquipments; r++) {
86.         let typeOfWeapon = "";
87.         typeOfWeapon = arrOfEquipments[r];
88.  
89.         if (typeOfWeapon == upgrade) {
90.           arrOfEquipments.splice(r + 1, 0, `${currentWeapon}:${upgrade}`);
91.         }
92.       }
93.     }
94.   }
95.   console.log(arrOfEquipments.join(" "));
96. }