R Coding Challenges

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

5 Challenges Available

All Challenges R Basics Vectors Strings Statistics Conditional Statements dplyr

Reverse a Vector

Write an R function solution(x) that returns the vector x in reverse order. Example solution(c(1, ...

vectors Solve →

Sort Vector Ascending

Write an R function solution(x) that returns the elements of x sorted in ascending order. Example ...

vectors Solve →

Unique Elements

Write an R function solution(x) that returns the unique elements of x, keeping their first-appearanc...

vectors Solve →

Cumulative Sum

Write an R function solution(x) that returns the cumulative sum of the numeric vector x. Example s...

vectors Solve →

Range (Max Minus Min)

Write an R function solution(x) that returns the range (maximum minus minimum) of the numeric vector...

vectors 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.