1
/**
2
 * @param {number[]} balance
3
 */
4
var Bank = function (balance) {
5
  this.arr = balance;
6
};
7

8
/**
9
 * @param {number} account1
10
 * @param {number} account2
11
 * @param {number} money
12
 * @return {boolean}
13
 */
14
Bank.prototype.transfer = function (account1, account2, money) {
15
  if (
16
    this.arr[account1 - 1] >= money &&
17
    this.arr.length >= account1 &&
18
    this.arr.length >= account2
19
  ) {
20
    this.arr[account1 - 1] -= money;
21
    this.arr[account2 - 1] += money;
22
    return true;
23
  }
24
  return false;
25
};
26

27
/**
28
 * @param {number} account
29
 * @param {number} money
30
 * @return {boolean}
31
 */
32
Bank.prototype.deposit = function (account, money) {
33
  if (this.arr.length >= account) {
34
    this.arr[account - 1] += money;
35
    return true;
36
  }
37
  return false;
38
};
39

40
/**
41
 * @param {number} account
42
 * @param {number} money
43
 * @return {boolean}
44
 */
45
Bank.prototype.withdraw = function (account, money) {
46
  if (this.arr.length >= account && this.arr[account - 1] >= money) {
47
    this.arr[account - 1] -= money;
48
    return true;
49
  }
50
  return false;
51
};
52

53
/**
54
 * Your Bank object will be instantiated and called as such:
55
 * var obj = new Bank(balance)
56
 * var param_1 = obj.transfer(account1,account2,money)
57
 * var param_2 = obj.deposit(account,money)
58
 * var param_3 = obj.withdraw(account,money)
59
 */