Code Challenges

Get better at coding with practice problems.

Coding Challenges

Select a problem, write code, run test cases, and submit your solution.

Start with beginner challenges

String Manipulation String Counting Character

Intermediate

Implement the `firstNonRepeatingCharacter` method that returns the first character in the text that appears only once.

String Manipulation String

Intermediate

Implement the method `reverseWords` that reverses the order of words in a string.

String Manipulation String

Intermediate

Implement the method `longestCommonPrefix` that returns the shared starting text of all strings.

String Manipulation Hash Map

Intermediate

Implement the method `isAnagram` that takes two strings and returns `true` if they are anagrams of each other, otherwise returns `false`.

String Manipulation String

Learner

Implement the method `removeVowels` that takes a string as input and returns the string after removing all vowels from it.

String Manipulation Decision Making String

Learner

Write a function named `isPalindrome` that determines whether a given string is a palindrome.

String Manipulation String

70% solved Learner

Implement the `reverseString` method, which accepts a `string` and returns its reverse.