Add new Rust exercises

One of the easiest ways to add new exercises to the Rust track is to translate them from other language tracks on Exercism. This page lists all of the problem specifications in the common pool of exercises which have not yet been implemented in Rust.

The icon links to the language-independent description of the problem.

The icon links to the canonical test data.

We also link to all the implementations of each exercise in other languages, which you can use for inspiration.

Once you've picked an exercise, follow the instructions in this guide and submit your pull request to the Rust track repository on GitHub.




Secret Handshake

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

Flatten Array

Take a nested list and return a single list with all values except nil/null

Two Fer

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


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

Binary Search Tree

Insert and search for numbers in a binary tree.

List Ops

Implement basic list operations


Implement the `keep` and `discard` operation on collections. Given a collection and a predicate on the collection's elements, `keep` returns a new collection containing those elements where the predicate is true, while `discard` returns a new collection containing those elements where the predicate is false.


Correctly determine change to be given using the least number of coins

Linked List

Implement a doubly linked list

Palindrome Products

Detect palindrome products in a given range.


Take input text and output it transposed.

Food Chain

Generate the lyrics of the song 'I Know an Old Lady Who Swallowed a Fly'

Kindergarten Garden

Given a diagram, determine which plants each child in the kindergarten class is responsible for.


Given a string representing a matrix of numbers, return the rows and columns of that matrix.

Simple Cipher

Implement a simple shift cipher like Caesar and a more secure substitution cipher

Bank Account

Simulate a bank account supporting opening/closing, withdraws, and deposits of money. Watch out for concurrent transactions!

Twelve Days

Output the lyrics to 'The Twelve Days of Christmas'

Complex Numbers

Implement complex numbers.


Compute the result for a game of Hex / Polygon


Output the nursery rhyme 'This is the House that Jack Built'.

Spiral Matrix

Given the size, return a square matrix of numbers in spiral order.

Armstrong Numbers

Determine if a number is an Armstrong number

Rail Fence Cipher

Implement encoding and decoding for the rail fence cipher.


Creating a zipper for a binary tree.


Refactor a Markdown parser


Reparent a graph on a selected node

Scale Generator

Generate musical scales, given a starting note and a set of intervals.

Word Search

Create a program to solve a word search puzzle.

Error Handling

Implement various kinds of error handling and resource management


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

Zebra Puzzle

Solve the zebra puzzle.

Go Counting

Count the scored points on a Go board.

Rational Numbers

Implement rational numbers.

Dot Dsl

Write a Domain Specific Language similar to the Graphviz dot language

Sgf Parsing

Parsing a Smart Game Format string.

Tree Building

Refactor a tree building algorithm.


Implement the logic of the hangman game using functional reactive programming.


Refactor a ledger printer.

Lens Person

Use lenses to update nested records (specific to languages with immutable data).


Report network IO statistics


Score a single throw of dice in the game Yacht