Adds code for paradigms.

oop/code/OopBankAccount.java

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+public class OopBankAccount {
+    private Integer number;
+    private Integer balance;
+
+    public OopBankAccount(Integer number, Integer balance) {
+        this.number = number;
+        this.balance = balance;
+    }
+
+    void deposit(Integer amount) {
+        this.balance  += amount;
+    }
+
+    void withdraw(Integer amount) {
+        this.balance  += amount;
+    }
+
+    void transfer(OopBankAccount destination, Integer amount) {
+        this.withdraw(amount);
+        destination.deposit(amount);
+    }
+
+}

oop/code/procedural_transfer.py

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+
+accounts = []
+
+def transfer(source: int, destination: int, amount: int) -> None:
+    
+    source_account = get_account(source)
+    update_account(source_account, -amount)
+
+    destination_account = get_account(destination)
+    update_account(destination_account, amount)
+
+def get_account(number: int) -> dict:
+    return list(filter(lambda account: account['number'] == number, accounts))[0]
+
+def update_account(account: int, delta: int) -> None:
+    account['balance'] += delta
+
+if __name__ == '__main__':
+    accounts.append({'number': 1, 'balance': 100})
+    accounts.append({'number': 2, 'balance': 200})
+
+    transfer(1, 2, 50)
+    print(accounts)