What Javascript coding challenges are perfect for beginners?

For beginners, it’s best to start with JavaScript coding challenges that focus on core language features and basic problem-solving patterns. Here are some beginner-friendly JavaScript coding challenges, including key concepts each challenge helps develop:

1. Reverse a String

• Challenge: Write a function that takes a string as input and returns the string reversed.
• Concepts Practiced: String manipulation, array methods (split, reverse, join).
• Example:

  function reverseString(str) {
    return str.split('').reverse().join('');
  }

2. Check for Palindrome

• Challenge: Create a function that checks if a given string is a palindrome (reads the same backward as forward).
• Concepts Practiced: String manipulation, conditional logic.
• Example:

  function isPalindrome(str) {
    return str === str.split('').reverse().join('');
  }

3. Find the Maximum Value in an Array

• Challenge: Write a function to find the largest number in an array.
• Concepts Practiced: Array methods, loops, or Math.max.
• Example:

  function findMax(arr) {
    return Math.max(...arr);
  }

4. FizzBuzz

• Challenge: Print numbers from 1 to 100. For multiples of 3, print "Fizz"; for multiples of 5, print "Buzz"; for multiples of both, print "FizzBuzz."
• Concepts Practiced: Loops, conditional logic.
• Example:

  function fizzBuzz() {
    for (let i = 1; i <= 100; i++) {
      if (i % 3 === 0 && i % 5 === 0) console.log('FizzBuzz');
      else if (i % 3 === 0) console.log('Fizz');
      else if (i % 5 === 0) console.log('Buzz');
      else console.log(i);
    }
  }

5. Factorial of a Number

• Challenge: Create a function that returns the factorial of a given number.
• Concepts Practiced: Loops, recursion.
• Example:

  function factorial(n) {
    if (n <= 1) return 1;
    return n * factorial(n - 1);
  }

6. Sum of Array Elements

• Challenge: Write a function to find the sum of all elements in an array.
• Concepts Practiced: Array manipulation, loops, reduce.
• Example:

  function sumArray(arr) {
    return arr.reduce((sum, num) => sum + num, 0);
  }

7. Remove Duplicates from an Array

• Challenge: Write a function that removes duplicate values from an array.
• Concepts Practiced: Set data structure, array manipulation.
• Example:

  function removeDuplicates(arr) {
    return [...new Set(arr)];
  }

8. Count Occurrences of Characters in a String

• Challenge: Create a function that counts how often each character appears in a string.
• Concepts Practiced: Object manipulation, loops, string traversal.
• Example:

  function charCount(str) {
    const counts = {};
    for (let char of str) {
      counts[char] = counts[char] ? counts[char] + 1 : 1;
    }
    return counts;
  }

9. Check for Prime Numbers

• Challenge: Write a function to determine if a number is prime (only divisible by 1 and itself).
• Concepts Practiced: Loops, conditional logic, basic math.
• Example:

  function isPrime(num) {
    if (num <= 1) return false;
    for (let i = 2; i <= Math.sqrt(num); i++) {
      if (num % i === 0) return false;
    }
    return true;
  }

10. Merge Two Sorted Arrays

• Challenge: Write a function to merge two sorted arrays into a single sorted array.
• Concepts Practiced: Array manipulation, loops.
• Example:

  function mergeSortedArrays(arr1, arr2) {
    return [...arr1, ...arr2].sort((a, b) => a - b);
  }

These challenges focus on essential JavaScript concepts that are crucial for beginners. For structured learning and additional practice, DesignGurus.io offers an excellent course called Grokking JavaScript Fundamentals that covers core JavaScript concepts, coding patterns, and problem-solving techniques tailored for beginner and intermediate levels. This course can further build your foundational knowledge and help you approach more advanced challenges confidently.