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Exercises on the ReasonML track

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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