Recursion practice in JavaScript

Practice recursion with JavaScript

Solve 53 coding challenges: read each prompt, write a recursive solution, then run the tests in your browser.

Open the playground Start with Factorial

Choose a recursion challenge

Problem 1Factorial Problem 2Sum of Integers Problem 3Sum Integers in Array Problem 4Check if Even Problem 5Sum Below Problem 6Integer Range Problem 7Compute Exponent Problem 8Power of Two Problem 9Reverse String Problem 10Palindrome Problem 11Modulo Problem 12Multiply Problem 13Divide Problem 14Greatest Common Divisor Problem 15Compare Strings Problem 16Create array from string Problem 17Reverse an array Problem 18Build an array with a given value Problem 19FizzBuzz Problem 20Count value in array Problem 21Recursive Map Problem 22Count key in object Problem 23Count value in object Problem 24Replace keys in object Problem 25First n Fibonacci Problem 26Return nth Fibonacci Problem 27Capitalize words in array Problem 28Capitalize first letter Problem 29Sum even numbers in nested objects Problem 30Flatten nested arrays Problem 31Tally letters in string Problem 32Eliminate consecutive duplicates Problem 33Augment each element Problem 34Minimize zeroes Problem 35Alternate sign Problem 36Convert numbers to text Problem 37Count Tags Problem 38Binary Search Problem 39Merge Sort Problem 40Clone Problem 41Nested Array Depth Problem 42Deep Includes Problem 43Count Nested Arrays Problem 44Object Path Lookup Problem 45Deep Freeze Problem 46Tree Sum Problem 47Find In Tree Problem 48Subsets Problem 49String Permutations Problem 50Generate Parentheses Problem 51Element Spellable Problem 52Can Make Playlist Problem 53Chunk Array