524
students have developed their Unison skills on Exercism.

Students
524
Submissions
4,881
Mentoring Discussions
32

The Unison track needs attention ⚠️

Building

Build

Use your knowledge to build the Unison track itself

Build Test Runners

Learn More

Create Test Runners that have the single responsibility of taking a solution, running all tests and returning a standardized output.

Usage statistics

Total Test Runner Runs
4,867
Test Run Pass Rate
31.1% (1516)
Test Run Fail Rate
16.4% (798)
Test Run Error Rate
52.5% (2553)

Build Analyzers

Learn More

Build an Analyzer for Unison: Exercism's analyzers automatically assess student's submissions and provide mentor-style commentary.

Next goal: Build an Analyzer. Find out more.

Build Representers

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Build a Representer: a bit of code that has the single responsibility of taking a solution and returning a normalized representation of it.

Next goal: Build a Representer. Find out more.

Create Practice Exercises

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Practice Exercises are exercises designed to allow students to solve an arbitrary problem, with the aim of them making use of the concepts they have learned so far.

Next goal: Implement at least 40 practice exercises. Find out more.

Usage statistics

31 active practice exercises
Started
Attempts
Completions
Mentoring requests
Hello World Hello World
435
689 (avg. 1.6)
381 (87.6%)
0 (0.0%)
Acronym Acronym
285
1,572 (avg. 5.5)
102 (35.8%)
10 (3.5%)
Allergies Allergies
70
197 (avg. 2.8)
45 (64.3%)
3 (4.3%)
Armstrong Numbers Armstrong Numbers
96
363 (avg. 3.8)
69 (71.9%)
6 (6.3%)
Bowling Bowling
29
45 (avg. 1.6)
16 (55.2%)
1 (3.4%)
Clock Clock
34
105 (avg. 3.1)
23 (67.6%)
1 (2.9%)
Crypto Square Crypto Square
21
162 (avg. 7.7)
16 (76.2%)
0 (0.0%)
Change Change
20
73 (avg. 3.7)
11 (55.0%)
0 (0.0%)
Collatz Conjecture Collatz Conjecture
51
140 (avg. 2.7)
41 (80.4%)
4 (7.8%)
Darts Darts
19
57 (avg. 3.0)
16 (84.2%)
0 (0.0%)
Diamond Diamond
12
38 (avg. 3.2)
10 (83.3%)
0 (0.0%)
All Your Base All Your Base
17
36 (avg. 2.1)
9 (52.9%)
0 (0.0%)
Leap Leap
40
120 (avg. 3.0)
37 (92.5%)
1 (2.5%)
Matching Brackets Matching Brackets
21
139 (avg. 6.6)
12 (57.1%)
0 (0.0%)
Majority Element Majority Element
23
143 (avg. 6.2)
11 (47.8%)
3 (13.0%)
Nucleotide Count Nucleotide Count
34
99 (avg. 2.9)
28 (82.4%)
1 (2.9%)
RNA Transcription RNA Transcription
29
64 (avg. 2.2)
26 (89.7%)
0 (0.0%)
Rotational Cipher Rotational Cipher
5
37 (avg. 7.4)
4 (80.0%)
0 (0.0%)
Scale Generator Scale Generator
9
122 (avg. 13.6)
7 (77.8%)
0 (0.0%)
Sieve Sieve
13
21 (avg. 1.6)
8 (61.5%)
0 (0.0%)
Simple Linked List Simple Linked List
16
32 (avg. 2.0)
13 (81.3%)
0 (0.0%)
Space Age Space Age
25
58 (avg. 2.3)
22 (88.0%)
0 (0.0%)
Spiral Matrix Spiral Matrix
9
19 (avg. 2.1)
6 (66.7%)
0 (0.0%)
Stream Ops Stream Ops
20
168 (avg. 8.4)
11 (55.0%)
1 (5.0%)
Sublist Sublist
11
18 (avg. 1.6)
8 (72.7%)
0 (0.0%)
Sum Of Multiples Sum Of Multiples
23
115 (avg. 5.0)
19 (82.6%)
0 (0.0%)
Raindrops Raindrops
24
79 (avg. 3.3)
23 (95.8%)
2 (8.3%)
Run Length Encoding Run Length Encoding
29
78 (avg. 2.7)
19 (65.5%)
2 (6.9%)
Queen Attack Queen Attack
11
25 (avg. 2.3)
8 (72.7%)
0 (0.0%)
Zebra Puzzle Zebra Puzzle
10
18 (avg. 1.8)
4 (40.0%)
0 (0.0%)
Zipper Zipper
13
49 (avg. 3.8)
7 (53.8%)
0 (0.0%)
99 unimplemented practice exercises
Affine Cipher Affine Cipher
Alphametics Alphametics
Anagram Anagram
Atbash Cipher Atbash Cipher
Bank Account Bank Account
Binary Search Binary Search
Binary Search Tree Binary Search Tree
Bob Bob
Book Store Book Store
Bottle Song Bottle Song
Circular Buffer Circular Buffer
Complex Numbers Complex Numbers
Connect Connect
Custom Set Custom Set
D&D Character D&D Character
DOT DSL DOT DSL
Difference of Squares Difference of Squares
Dominoes Dominoes
ETL ETL
Error Handling Error Handling
Flatten Array Flatten Array
Food Chain Food Chain
Forth Forth
Gigasecond Gigasecond
Go Counting Go Counting
Grade School Grade School
Grains Grains
Grep Grep
Hamming Hamming
Hangman Hangman
High Scores High Scores
House House
ISBN Verifier ISBN Verifier
Isogram Isogram
Killer Sudoku Helper Killer Sudoku Helper
Kindergarten Garden Kindergarten Garden
Knapsack Knapsack
Largest Series Product Largest Series Product
Ledger Ledger
Lens Person Lens Person
Linked List Linked List
List Ops List Ops
Luhn Luhn
Markdown Markdown
Matrix Matrix
Meetup Meetup
Micro Blog Micro Blog
Minesweeper Minesweeper
Nth Prime Nth Prime
OCR Numbers OCR Numbers
POV POV
PaaS I/O PaaS I/O
Palindrome Products Palindrome Products
Pangram Pangram
Parallel Letter Frequency Parallel Letter Frequency
Pascal's Triangle Pascal's Triangle
Perfect Numbers Perfect Numbers
Phone Number Phone Number
Pig Latin Pig Latin
Poker Poker
Prime Factors Prime Factors
Protein Translation Protein Translation
Proverb Proverb
Pythagorean Triplet Pythagorean Triplet
REST API REST API
Rail Fence Cipher Rail Fence Cipher
Rational Numbers Rational Numbers
React React
Rectangles Rectangles
Resistor Color Resistor Color
Resistor Color Duo Resistor Color Duo
Resistor Color Trio Resistor Color Trio
Reverse String Reverse String
Robot Name Robot Name
Robot Simulator Robot Simulator
Roman Numerals Roman Numerals
SGF Parsing SGF Parsing
Saddle Points Saddle Points
Satellite Satellite
Say Say
Scrabble Score Scrabble Score
Secret Handshake Secret Handshake
Series Series
Simple Cipher Simple Cipher
Square Root Square Root
State of Tic-Tac-Toe State of Tic-Tac-Toe
Strain Strain
Tournament Tournament
Transpose Transpose
Tree Building Tree Building
Triangle Triangle
Twelve Days Twelve Days
Two Bucket Two Bucket
Two-Fer Two-Fer
Variable Length Quantity Variable Length Quantity
Word Count Word Count
Word Search Word Search
Wordy Wordy
Yacht Yacht