When you're logged in, you can say
exercism fetch racket to get the next available exercise on the track.
Every time you submit a solution to an exercise, you will get the next in line the next time you fetch.
If you want to try a specific exercise, you can always fetch it directly (commands are listed below).
The exercises are ordered roughly in order of difficulty.
- Hello World The classical introductory exercise. Just say "Hello, World!"
- Grains Calculate the number of grains of wheat on a chessboard given that the number on each square doubles.
- 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.
- Gigasecond Calculate the moment when someone has lived for 10^9 seconds.
- 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.
- Anagram Given a word and a list of possible anagrams, select the correct sublist.
- Rna Transcription Given a DNA strand, return its RNA complement (per RNA 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.
- 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 contents of which depend 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