R Coding Challenges

Practice R step by step. Code, run tests, and ask the AI Tutor for hints.

3 Challenges Available

All Challenges R Basics Vectors Strings Statistics Conditional Statements dplyr

Count Distinct Groups

Write an R function solution(x) that uses dplyr to return the number of distinct values in the colum...

dplyr Solve →

Mean of a Column

Write an R function solution(x) that uses dplyr to return the mean of the column value in the data f...

dplyr Solve →

Maximum Group Total

Write an R function solution(x) that uses dplyr to group x by group, sum the value column within eac...

dplyr Solve →

Every challenge runs your code by calling a function. You must define a function named solution(...) that returns the answer.

Key rule: use return — not print(). The grader only checks the returned value; anything you print is ignored.

✗ Won't be graded

def solution(a, b):
    print(a + b)

✓ Correct

def solution(a, b):
    return a + b

What the grader sends

Your function is called with the challenge's test inputs, for example:

solution(3, 5)   # expects 8

Match the parameter names and count shown in the challenge description, and always finish with a return.