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Exercises on the ReasonML track

Join the ReasonML Track
24 exercises to help you master ReasonML
easy

Hello World

The classical introductory exercise. Just say "Hello, World!"
setting up reasonml dev environment
strings
easy

Two Fer

Create a sentence of the form "One for X, one for me."
functions
option
string interpolation
easy

Resistor Color

Convert a resistor band's color to its numeric representation
misc
easy

Leap

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

Space Age

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

Bob

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

RNA Transcription

Given a DNA strand, return its RNA Complement Transcription.
list map function
lists
variants
easy

Word Count

Given a phrase, count the occurrences of each word in that phrase.
list map function
lists
pattern recognition
regular expressions
variants
easy

Raindrops

Convert a number to a string, the content of which depends on the number's factors.
fun expressions
list map function
easy

Armstrong Numbers

Determine if a number is an Armstrong number
arrays
folding
algorithms
math
easy

Anagram

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

Pangram

Determine if a sentence is a pangram.
strings
easy

Isogram

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

Phone Number

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

Roman Numerals

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

Binary Search

Implement a binary search algorithm.
arrays
recursion
medium

Run Length Encoding

Implement run-length encoding and decoding.
strings
converting strings to ints
medium

Minesweeper

Add the numbers to a minesweeper board
strings
arrays
medium

Change

Correctly determine change to be given using the least number of coins
integers
recursion
dynamic programming
easy

Acronym

Convert a long phrase to its acronym
regular expressions
strings
easy

All Your Base

Convert a number, represented as a sequence of digits in one base, to any other base.
algorithms
integers
lists
folding
math
easy

Accumulate

Implement the `accumulate` operation, which, given a collection and an operation to perform on each element of the collection, returns a new collection containing the result of applying that operation to each element of the input collection.
algorithms
lists
folding
medium

Allergies

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

Protein Translation

Translate RNA sequences into proteins.
lists
data transform
hash map lookup