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Exercises on the R track

32 exercises to help you master R
easy

Hello World

The classical introductory exercise. Just say "Hello, World!"
optional values
text formatting
easy

Leap

Given a year, report if it is a leap year.
booleans
integers
logic
easy

Hamming

Calculate the Hamming difference between two DNA strands.
filtering
strings
easy

Rna Transcription

Given a DNA strand, return its RNA Complement Transcription.
strings
transforming
easy

Difference Of Squares

Find the difference between the square of the sum and the sum of the squares of the first N natural numbers.
integers
math
easy

Raindrops

Convert a number to a string, the contents of which depend on the number's factors.
filtering
text formatting
easy

Grains

Calculate the number of grains of wheat on a chessboard given that the number on each square doubles.
integers
easy

Bob

Bob is a lackadaisical teenager. In conversation, his responses are very limited.
control flow conditionals
strings
easy

Anagram

Given a word and a list of possible anagrams, select the correct sublist.
filtering
strings
easy

Space Age

Given an age in seconds, calculate how old someone is in terms of a given planet's solar years.
floating point numbers
easy

Sum Of Multiples

Given a number, find the sum of all the multiples of particular numbers up to but not including that number.
lists
math
easy

Word Count

Given a phrase, count the occurrences of each word in that phrase.
strings
transforming
easy

Phone Number

Clean up user-entered phone numbers so that they can be sent SMS messages.
parsing
transforming
easy

Rotational Cipher

Create an implementation of the rotational cipher, also sometimes called the Caesar cipher.
strings
easy

Scrabble Score

Given a word, compute the scrabble score for that word.
strings
transforming
easy

Isogram

Determine if a word or phrase is an isogram.
filtering
strings
easy

Beer Song

Produce the lyrics to that beloved classic, that field-trip favorite: 99 Bottles of Beer on the Wall.
control flow conditionals
text formatting
easy

Perfect Numbers

Determine if a number is perfect, abundant, or deficient based on Nicomachus' (60 - 120 CE) classification scheme for natural numbers.
control flow conditionals
integers
math
easy

Prime Factors

Compute the prime factors of a given natural number.
integers
math
easy

Sieve

Use the Sieve of Eratosthenes to find all the primes from 2 up to a given number.
filtering
math
easy

Largest Series Product

Given a string of digits, calculate the largest product for a contiguous substring of digits of length n.
integers
strings
transforming
math
easy

Luhn

Given a number determine whether or not it is valid per the Luhn formula.
algorithms
strings
transforming
easy

Secret Handshake

Given a decimal number, convert it to the appropriate sequence of events for a secret handshake.
bitwise operations
control flow conditionals
easy

Pascals Triangle

Compute Pascal's triangle up to a given number of rows.
control flow conditionals
math
medium

Tournament

Tally the results of a small football competition.
parsing
text formatting
easy

Nucleotide Count

Given a DNA string, compute how many times each nucleotide occurs in the string.
lists
transforming
easy

Pangram

Determine if a sentence is a pangram.
regular expressions
strings
easy

Triangle

Determine if a triangle is equilateral, isosceles, or scalene.
classes
easy

Collatz Conjecture

Calculate the number of steps to reach 1 using the Collatz conjecture
control flow conditionals
recursion
math
easy

Allergies

Given a person's allergy score, determine whether or not they're allergic to a given item, and their full list of allergies.
control flow conditionals
filtering
lists
medium

Crypto Square

Implement the classic method for composing secret messages called a square code.
regular expressions
strings
text formatting
transforming
easy

Diamond

Given a letter, print a diamond starting with 'A' with the supplied letter at the widest point.
control flow loops
text formatting