1,563
students have developed their 8th skills on Exercism.

Students
1,563
Submissions
4,001
Mentoring Discussions
6

The 8th track needs attention ⚠️

Building

Build

Use your knowledge to build the 8th 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.

Next goal: Get Test Runners to Version 2. 8th is currently utilising a Version 1 Test Runner. Find out more.

Usage statistics

Total Test Runner Runs
3,982
Test Run Pass Rate
11.6% (461)
Test Run Fail Rate
21.0% (838)
Test Run Error Rate
67.4% (2683)

Build Analyzers

Learn More

Build an Analyzer for 8th: 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 30 practice exercises. Find out more.

Usage statistics

20 active practice exercises
Started
Attempts
Completions
Mentoring requests
Hello World Hello World
1,098
2,756 (avg. 2.5)
142 (12.9%)
0 (0.0%)
Two Fer Two Fer
96
641 (avg. 6.7)
31 (32.3%)
3 (3.1%)
Gigasecond Gigasecond
33
50 (avg. 1.5)
20 (60.6%)
1 (3.0%)
Leap Leap
25
117 (avg. 4.7)
19 (76.0%)
0 (0.0%)
Triangle Triangle
20
152 (avg. 7.6)
15 (75.0%)
0 (0.0%)
Trinary (Base-3) Numbers Trinary (Base-3) Numbers
15
27 (avg. 1.8)
12 (80.0%)
0 (0.0%)
Bob Bob
10
13 (avg. 1.3)
8 (80.0%)
0 (0.0%)
Hamming Hamming
12
21 (avg. 1.8)
10 (83.3%)
0 (0.0%)
Raindrops Raindrops
10
23 (avg. 2.3)
7 (70.0%)
0 (0.0%)
Armstrong Numbers Armstrong Numbers
10
10 (avg. 1.0)
7 (70.0%)
0 (0.0%)
Isogram Isogram
9
10 (avg. 1.1)
7 (77.8%)
0 (0.0%)
Word Count Word Count
6
5 (avg. 0.8)
5 (83.3%)
0 (0.0%)
Acronym Acronym
7
6 (avg. 0.9)
6 (85.7%)
0 (0.0%)
Luhn Credit Card Number Checker Luhn Credit Card Number Checker
7
20 (avg. 2.9)
5 (71.4%)
1 (14.3%)
Collatz Conjecture Collatz Conjecture
10
35 (avg. 3.5)
9 (90.0%)
0 (0.0%)
Pangram Pangram
9
14 (avg. 1.6)
6 (66.7%)
0 (0.0%)
Yacht Yacht
8
42 (avg. 5.3)
7 (87.5%)
1 (12.5%)
Roman Numerals Roman Numerals
8
15 (avg. 1.9)
6 (75.0%)
0 (0.0%)
Reverse string Reverse string
10
35 (avg. 3.5)
8 (80.0%)
1 (10.0%)
Affine Cipher Affine Cipher
7
9 (avg. 1.3)
6 (85.7%)
0 (0.0%)
109 unimplemented practice exercises
All Your Base All Your Base
Allergies Allergies
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
Bowling Bowling
Change Change
Circular Buffer Circular Buffer
Clock Clock
Complex Numbers Complex Numbers
Connect Connect
Crypto Square Crypto Square
Custom Set Custom Set
D&D Character D&D Character
DOT DSL DOT DSL
Darts Darts
Diamond Diamond
Difference of Squares Difference of Squares
Dominoes Dominoes
ETL ETL
Error Handling Error Handling
Flatten Array Flatten Array
Food Chain Food Chain
Forth Forth
Go Counting Go Counting
Grade School Grade School
Grains Grains
Grep Grep
Hangman Hangman
High Scores High Scores
House House
ISBN Verifier ISBN Verifier
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
Markdown Markdown
Matching Brackets Matching Brackets
Matrix Matrix
Meetup Meetup
Micro Blog Micro Blog
Minesweeper Minesweeper
Nth Prime Nth Prime
Nucleotide Count Nucleotide Count
OCR Numbers OCR Numbers
POV POV
PaaS I/O PaaS I/O
Palindrome Products Palindrome Products
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
Queen Attack Queen Attack
REST API REST API
RNA Transcription RNA Transcription
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
Rotational Cipher Rotational Cipher
Run-Length Encoding Run-Length Encoding
SGF Parsing SGF Parsing
Saddle Points Saddle Points
Satellite Satellite
Say Say
Scale Generator Scale Generator
Scrabble Score Scrabble Score
Secret Handshake Secret Handshake
Series Series
Sieve Sieve
Simple Cipher Simple Cipher
Simple Linked List Simple Linked List
Space Age Space Age
Spiral Matrix Spiral Matrix
Square Root Square Root
State of Tic-Tac-Toe State of Tic-Tac-Toe
Strain Strain
Sublist Sublist
Sum of Multiples Sum of Multiples
Tournament Tournament
Transpose Transpose
Tree Building Tree Building
Twelve Days Twelve Days
Two Bucket Two Bucket
Variable Length Quantity Variable Length Quantity
Word Search Word Search
Wordy Wordy
Zebra Puzzle Zebra Puzzle
Zipper Zipper