Practice Exercises - CodeMentor JS

Hello World

Write a function that returns the string "Hello, World!"

function helloWorld() {
    return "Hello, World!";
}
helloWorld();

Output:

Number Guessing Game

Write a function that generates a random number between 1 and 100. The user will guess the number, and after each guess, they will be told whether their guess is too high, too low, or correct.

function startGuessingGame() {
const randomNumber = Math.floor(Math.random() * 100) + 1;
let guesses = 0;

function guessNumber() {
    const userGuess = prompt("Guess a number between 1 and 100:");
    guesses++;
    if (userGuess == randomNumber) {
        alert(`Correct! You guessed the number in ${guesses} attempts.`);
    } else if (userGuess < randomNumber) {
        alert("Too low! Try again.");
        guessNumber();
    } else if (userGuess > randomNumber) {
        alert("Too high! Try again.");
        guessNumber();
    }
}
                
                    guessNumber();
                }

Output:

Palindrome Checker

Write a function that checks if a given string is a palindrome.

function isPalindrome(str) {
    const cleanedStr = str.replace(/[^a-zA-Z0-9]/g, '').toLowerCase();
    const reversedStr = cleanedStr.split('').reverse().join('');
    return cleanedStr === reversedStr;
}
isPalindrome('racecar');