Exercises on the R Track | Exercism

Hello World

The classical introductory exercise. Just say "Hello, World!"

optional values

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Two Fer

Create a sentence of the form "One for X, one for me."

Leap

Given a year, report if it is a leap year.

Hamming

Calculate the Hamming difference between two DNA strands.

RNA Transcription

Given a DNA strand, return its RNA Complement Transcription.

Difference Of Squares

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

Raindrops

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

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Grains

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

Bob

Bob is a lackadaisical teenager. In conversation, his responses are very limited.

control flow conditionals

Anagram

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

Space Age

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

floating point numbers

Sum Of Multiples

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

Word Count

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

Phone Number

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

Rotational Cipher

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

Scrabble Score

Given a word, compute the scrabble score for that word.

Isogram

Determine if a word or phrase is an isogram.

Beer Song

Produce the lyrics to that beloved classic, that field-trip favorite: 99 Bottles of Beer on the Wall.

control flow conditionals

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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

Prime Factors

Compute the prime factors of a given natural number.

Sieve

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

Largest Series Product

Given a string of digits, calculate the largest product for a contiguous substring of digits of length n.

Luhn

Given a number determine whether or not it is valid per the Luhn formula.

Secret Handshake

Given a decimal number, convert it to the appropriate sequence of events for a secret handshake.

bitwise operations

control flow conditionals

Pascal's Triangle

Compute Pascal's triangle up to a given number of rows.

control flow conditionals

Tournament

Tally the results of a small football competition.

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Nucleotide Count

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

Pangram

Determine if a sentence is a pangram.

regular expressions

Triangle

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

Collatz Conjecture

Calculate the number of steps to reach 1 using the Collatz conjecture

control flow conditionals

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

Crypto Square

Implement the classic method for composing secret messages called a square code.

regular expressions

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Diamond

Given a letter, print a diamond starting with 'A' with the supplied letter at the widest point.

control flow loops

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Acronym

Convert a long phrase to its acronym