Exercises on the Racket Track | Exercism

Hello World

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

Reverse String

Reverse a string

All Your Base

Convert a number, represented as a sequence of digits in one base, to any other base.

Grains

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

Two Fer

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

optional values

text formatting

Leap

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

Difference Of Squares

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

Perfect Numbers

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

Armstrong Numbers

Determine if a number is an Armstrong number

Gigasecond

Given a moment, determine the moment that would be after a gigasecond has passed.

Bob

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

Collatz Conjecture

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

Hamming

Calculate the Hamming difference between two DNA strands.

Scrabble Score

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

Roman Numerals

Write a function to convert from normal numbers to Roman Numerals.

Meetup

Calculate the date of meetups.

pattern recognition

Anagram

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

RNA Transcription

Given a DNA strand, return its RNA Complement Transcription.

ETL

We are going to do the `Transform` step of an Extract-Transform-Load.

Word Count

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

Isogram

Determine if a word or phrase is an isogram.

Phone Number

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

Nucleotide Count

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

Raindrops

Convert a number to a string, the content of which depends on the number's factors.

Grep

Search a file for lines matching a regular expression pattern. Return the line number and contents of each matching line.

Say

Given a number from 0 to 999,999,999,999, spell out that number in English.

Allergies

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

List Ops

Implement basic list operations

Acronym

Convert a long phrase to its acronym

Affine Cipher

Create an implementation of the Affine cipher, an ancient encryption algorithm from the Middle East.