1,101
students have developed their CoffeeScript skills on Exercism.

Students
1,101
Submissions
3,862
Mentoring Discussions
146

The CoffeeScript track needs attention ⚠️

Building

Build

Use your knowledge to build the CoffeeScript 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. CoffeeScript is currently utilising a Version 1 Test Runner. Find out more.

Usage statistics

Total Test Runner Runs
2,230
Test Run Pass Rate
35.9% (800)
Test Run Fail Rate
50.0% (1116)
Test Run Error Rate
14.1% (314)

Build Analyzers

Learn More

Build an Analyzer for CoffeeScript: 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

21 active practice exercises
Started
Attempts
Completions
Mentoring requests
Hello World Hello World
515
734 (avg. 1.4)
360 (69.9%)
2 (0.4%)
Queen Attack Queen Attack
113
281 (avg. 2.5)
38 (33.6%)
2 (1.8%)
Anagram Anagram
125
299 (avg. 2.4)
113 (90.4%)
3 (2.4%)
Beer Song Beer Song
39
79 (avg. 2.0)
29 (74.4%)
2 (5.1%)
Binary Binary
132
243 (avg. 1.8)
126 (95.5%)
10 (7.6%)
Luhn Luhn
66
172 (avg. 2.6)
61 (92.4%)
0 (0.0%)
Nucleotide Count Nucleotide Count
29
115 (avg. 4.0)
25 (86.2%)
3 (10.3%)
Palindrome Products Palindrome Products
39
84 (avg. 2.2)
31 (79.5%)
3 (7.7%)
Pascals Triangle Pascals Triangle
26
54 (avg. 2.1)
20 (76.9%)
0 (0.0%)
Triangle Triangle
72
106 (avg. 1.5)
67 (93.1%)
2 (2.8%)
Accumulate Accumulate
144
210 (avg. 1.5)
137 (95.1%)
9 (6.3%)
Clock Clock
31
35 (avg. 1.1)
24 (77.4%)
0 (0.0%)
Hexadecimal Hexadecimal
86
120 (avg. 1.4)
83 (96.5%)
6 (7.0%)
Linked List Linked List
26
51 (avg. 2.0)
23 (88.5%)
0 (0.0%)
Trinary Trinary
94
116 (avg. 1.2)
92 (97.9%)
1 (1.1%)
Word Count Word Count
203
289 (avg. 1.4)
189 (93.1%)
15 (7.4%)
Nth Prime Nth Prime
46
57 (avg. 1.2)
40 (87.0%)
4 (8.7%)
Wordy Wordy
32
41 (avg. 1.3)
28 (87.5%)
0 (0.0%)
Atbash Cipher Atbash Cipher
25
35 (avg. 1.4)
22 (88.0%)
1 (4.0%)
Binary Search Tree Binary Search Tree
51
80 (avg. 1.6)
48 (94.1%)
4 (7.8%)
Bob Bob
371
661 (avg. 1.8)
340 (91.6%)
82 (22.1%)
112 unimplemented practice exercises
Acronym Acronym
Affine Cipher Affine Cipher
All Your Base All Your Base
Allergies Allergies
Alphametics Alphametics
Armstrong Numbers Armstrong Numbers
Bank Account Bank Account
Binary Search Binary Search
Book Store Book Store
Bottle Song Bottle Song
Bowling Bowling
Change Change
Circular Buffer Circular Buffer
Collatz Conjecture Collatz Conjecture
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
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
Leap Leap
Ledger Ledger
Lens Person Lens Person
List Ops List Ops
Markdown Markdown
Matching Brackets Matching Brackets
Matrix Matrix
Meetup Meetup
Micro Blog Micro Blog
Minesweeper Minesweeper
OCR Numbers OCR Numbers
POV POV
PaaS I/O PaaS I/O
Pangram Pangram
Parallel Letter Frequency Parallel Letter Frequency
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
RNA Transcription RNA Transcription
Rail Fence Cipher Rail Fence Cipher
Raindrops Raindrops
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
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
Two-Fer Two-Fer
Variable Length Quantity Variable Length Quantity
Word Search Word Search
Yacht Yacht
Zebra Puzzle Zebra Puzzle
Zipper Zipper