mcsee

const pets = '😺🐶😺';
const justDogs = pets.replace('😺', '🐩');

const catsArePresent = justDogs.includes('😺');
// returns true

mcsee

import java.util.Date;

public class CreditCard {
    private String cardNumber;
    private Date expiryDate;

    public CreditCard(String cardNumber, Date expiryDate) {
        // Not a complete date
        this.cardNumber = cardNumber;
        this.expiryDate = expiryDate;

mcsee

public class CreditCard {
    private String cardNumber;
    private int expiryMonth;
    private int expiryYear;

    public CreditCard(String cardNumber, int expiryMonth, int expiryYear) {
        this.cardNumber = cardNumber;
        this.expiryMonth = expiryMonth;
        this.expiryYear = expiryYear;
        // No validations on number ranges?

mcsee

def calculate(mathOperand, firstArgument, secondArgument):
    if mathOperand == '+':
        return firstArgument + secondArgument
    elif mathOperand == '-':
        return firstArgument - secondArgument
    elif mathOperand == '*':
        return firstArgument * secondArgument
    elif mathOperand == '/':
        if secondArgument != 0:
            return firstArgument / secondArgument

mcsee

def calculate(mathOperand, firstArgument, secondArgument):
    return eval(f'{firstArgument} {mathOperand} {secondArgument}')

# Sample usage to multiply two numbers
result = calculate('*', 4, 6)

# Injection to remove all files
calculate('', "__import__('os').system('rm -rf *')",''))

mcsee

VALID_COLUMNS = ['name', 'gender', 'email']

def process_API_information(data):
    invalid_columns = []
    for column in data.keys():
        if column not in VALID_COLUMNS:
            invalid_columns.append(column)
    
    assert not invalid_columns, "Invalid columns detected."  
    # No details were provided about which columns are invalid

mcsee

VALID_COLUMNS = ['name', 'gender', 'email']

def process_API_information(data):
    invalid_columns = [
        column for column in data.keys() if column not in VALID_COLUMNS
    ]
    
    if invalid_columns:
        raise ValueError(
            f"Invalid columns detected: {', '.join(invalid_columns)}"

mcsee

class Point {
    constructor(coordString) {
        this.coordString = coordString;
    }

    x() {
        const coords = this.coordString.split(',');
        if (coords.length !== 2) {
            throw new Error('Invalid coordinate string format');
        }

mcsee

class Point {
    constructor(x, y) {
        this.x = x;
        this.y = y;
    }
}

mcsee

// Step 27

/* when pressing remove, 
chose randomly the secret word from the words collection */ 

document.getElementById('remove').
    addEventListener('click', function(event) {
  var randomIndex = Math.floor(Math.random() * words.length);
  winnerWord = words[randomIndex];
  game = new Game(words, winnerWord);