766
students have developed their Unison skills on Exercism.

Students
766
Submissions
7,609
Mentoring Discussions
48

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
7,584
Test Run Pass Rate
30.7% (2329)
Test Run Fail Rate
14.3% (1083)
Test Run Error Rate
55.0% (4172)

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

Learn More

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

Learn More

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 50 practice exercises. Find out more.

Usage statistics

40 active practice exercises
Started
Attempts
Completions
Mentoring requests
Hello World Hello World
646
1,034 (avg. 1.6)
569 (88.1%)
0 (0.0%)
Acronym Acronym
432
2,340 (avg. 5.4)
156 (36.1%)
19 (4.4%)
Allergies Allergies
99
268 (avg. 2.7)
62 (62.6%)
4 (4.0%)
Armstrong Numbers Armstrong Numbers
148
597 (avg. 4.0)
100 (67.6%)
8 (5.4%)
Bowling Bowling
40
113 (avg. 2.8)
22 (55.0%)
1 (2.5%)
Clock Clock
47
190 (avg. 4.0)
31 (66.0%)
1 (2.1%)
Crypto Square Crypto Square
28
207 (avg. 7.4)
20 (71.4%)
0 (0.0%)
Change Change
26
118 (avg. 4.5)
14 (53.8%)
0 (0.0%)
Collatz Conjecture Collatz Conjecture
78
229 (avg. 2.9)
58 (74.4%)
5 (6.4%)
Darts Darts
38
183 (avg. 4.8)
33 (86.8%)
0 (0.0%)
Diamond Diamond
16
43 (avg. 2.7)
13 (81.3%)
0 (0.0%)
All Your Base All Your Base
23
40 (avg. 1.7)
12 (52.2%)
0 (0.0%)
Leap Leap
68
187 (avg. 2.8)
58 (85.3%)
1 (1.5%)
Matching Brackets Matching Brackets
31
159 (avg. 5.1)
16 (51.6%)
1 (3.2%)
Majority Element Majority Element
31
157 (avg. 5.1)
16 (51.6%)
3 (9.7%)
Nucleotide Count Nucleotide Count
49
133 (avg. 2.7)
40 (81.6%)
1 (2.0%)
RNA Transcription RNA Transcription
44
87 (avg. 2.0)
38 (86.4%)
0 (0.0%)
Rotational Cipher Rotational Cipher
10
57 (avg. 5.7)
8 (80.0%)
0 (0.0%)
Scale Generator Scale Generator
13
129 (avg. 9.9)
9 (69.2%)
0 (0.0%)
Sieve Sieve
21
56 (avg. 2.7)
13 (61.9%)
0 (0.0%)
Simple Linked List Simple Linked List
21
42 (avg. 2.0)
17 (81.0%)
0 (0.0%)
Space Age Space Age
47
152 (avg. 3.2)
40 (85.1%)
0 (0.0%)
Spiral Matrix Spiral Matrix
14
27 (avg. 1.9)
9 (64.3%)
0 (0.0%)
Stream Ops Stream Ops
25
177 (avg. 7.1)
13 (52.0%)
2 (8.0%)
Sublist Sublist
21
43 (avg. 2.0)
16 (76.2%)
0 (0.0%)
Sum Of Multiples Sum Of Multiples
31
136 (avg. 4.4)
26 (83.9%)
0 (0.0%)
Raindrops Raindrops
49
169 (avg. 3.4)
45 (91.8%)
4 (8.2%)
Run Length Encoding Run Length Encoding
41
94 (avg. 2.3)
25 (61.0%)
3 (7.3%)
Queen Attack Queen Attack
18
42 (avg. 2.3)
13 (72.2%)
0 (0.0%)
Zebra Puzzle Zebra Puzzle
15
49 (avg. 3.3)
8 (53.3%)
0 (0.0%)
Zipper Zipper
18
64 (avg. 3.6)
9 (50.0%)
0 (0.0%)
Reverse String Reverse String
10
17 (avg. 1.7)
6 (60.0%)
0 (0.0%)
Protein Translation Protein Translation
4
5 (avg. 1.3)
2 (50.0%)
0 (0.0%)
Difference of Squares Difference of Squares
7
7 (avg. 1.0)
3 (42.9%)
0 (0.0%)
Knapsack Knapsack
3
1 (avg. 0.3)
1 (33.3%)
0 (0.0%)
Roman Numerals Roman Numerals
23
119 (avg. 5.2)
14 (60.9%)
0 (0.0%)
Largest Series Product Largest Series Product
4
5 (avg. 1.3)
2 (50.0%)
0 (0.0%)
ETL ETL
4
3 (avg. 0.8)
2 (50.0%)
0 (0.0%)
Bob Bob
10
53 (avg. 5.3)
6 (60.0%)
0 (0.0%)
Isogram Isogram
26
75 (avg. 2.9)
19 (73.1%)
2 (7.7%)
90 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
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
Dominoes Dominoes
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
Killer Sudoku Helper Killer Sudoku Helper
Kindergarten Garden Kindergarten Garden
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
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
Robot Name Robot Name
Robot Simulator Robot Simulator
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