JavaScript Code Challenges & Tips

1. Write a function that takes an array of integers and returns a new array with each integer squared.

2. Implement a function that checks if a string is a palindrome, ignoring spaces, punctuation, and capitalization.

3. Write a function to find the longest substring without repeating characters in a given string.

4. Create a function that takes two sorted arrays and merges them into a single sorted array.

5. Develop a function that takes an array of numbers and returns the highest product of three numbers.

6. Write a function that generates all possible combinations of a given string.

7. Implement a function that flattens a multidimensional array into a single-dimensional array.

8. Create a function that finds the first non-repeating character in a string.

9. Write a function that takes a deeply nested object and flattens it into a single-level object with dot-separated keys.

10. Develop a function that takes a number and returns an array of its prime factors.