bankAccount.js ( EASY but REVISE)

 /**

* Bank Account Credit and Debit -- Classes Practice Problems

Write a bank account class (BankAccount). It should have an instance variable

called balance which holds the current value. Assume initial balance is 0.

The class should have the following methods: credit and debit.

credit - takes an integer (>= 0) as input and increases the balance by that amount

debit - takes an integer (>= 0) as input and decreases the balance by that amount

Input

The first line contains an integer n, denoting the number of transactions.

This is followed by n lines each containing 2 space separated inputs.

The first input is either c (denoting credit) or d (denoting debit).

The second input is a non-negative integer denoting the amount.

Note: You don't have to worry about reading input or printing output.

The code for that is already provided.

Output

One integer, denoting the final balance of the account.

Example

Input:

3

c 100

c 500

d 200

Output:

400

The first line in input is 3, denoting 3 transactions.

First transaction is c 100, which means a credit of 100.

So the balance will become 100 (because initial balance is 0).

Second transaction is c 500, which means a credit of 500.

So the balance becomes 100 + 500 which is 600.

Third transaction is d 200, which means a debit of 200.

So balance becomes 600 - 200, which is 400.

So, the final balance is 400.

*/

let fs = require("fs");

let data = fs.readFileSync(0, 'utf-8');

let idx = 0;

data = data.split('\n');

function readLine() {

idx++;

return data[idx - 1];

}

// -------- Do NOT edit anything above this line ----------

class BankAccount {

constructor() {

this.balance = 0;

}

credit(transactionAmount) {

return this.balance += transactionAmount

// 0) first transaction is creit 0+100=> 100

// 1) 2nd transaction is credit 100+500 => 600

}

debit(transactionAmount) {

return this.balance -= transactionAmount

// 3) 3rd transaction is debit 600-200=> 400

// now there is no more transaction after this

// so this will be returned to the last line of code who called it and

also consoled there

}

}

// This part is only taking the input.

// DO NOT CHANGE ANYTHING BELOW THIS LINE

let n = parseInt(readLine());//3

let myAccount = new BankAccount(); // invoking the class BankAccount

for (let index = 0; index < n; index++) {

let currentTransaction = readLine().split(" ");// ["c","100"],["c","500"],["d","200"]

let typeOfTransaction = currentTransaction[0];// "c", "c" "d"

let transactionAmount = parseInt(currentTransaction[1]);//100 500 200

if (typeOfTransaction === "d") {

myAccount.debit(transactionAmount); // invoking debit function

}

else {

myAccount.credit(transactionAmount);// invoking credit function

}

}

console.log(myAccount.balance); // 400

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TERMINAL: