3,003
students have developed their Scheme skills on Exercism.

Students
3,003
Submissions
11,449
Mentoring Discussions
342

The Scheme track needs attention ⚠️

Building

Build

Use your knowledge to build the Scheme 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
9,269
Test Run Pass Rate
27.5% (2546)
Test Run Fail Rate
45.3% (4202)
Test Run Error Rate
27.2% (2521)

Build Analyzers

Learn More

Build an Analyzer for Scheme: 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 40 practice exercises. Find out more.

Usage statistics

39 active practice exercises
Started
Attempts
Completions
Mentoring requests
Hello World Hello World
1,676
2,847 (avg. 1.7)
1,094 (65.3%)
3 (0.2%)
Leap Leap
711
2,142 (avg. 3.0)
400 (56.3%)
91 (12.8%)
RNA Transcription RNA Transcription
346
1,456 (avg. 4.2)
191 (55.2%)
46 (13.3%)
Hamming Hamming
335
826 (avg. 2.5)
208 (62.1%)
59 (17.6%)
Grains Grains
216
882 (avg. 4.1)
161 (74.5%)
32 (14.8%)
Anagram Anagram
120
331 (avg. 2.8)
82 (68.3%)
15 (12.5%)
Difference of Squares Difference of Squares
153
307 (avg. 2.0)
121 (79.1%)
19 (12.4%)
Pascal's Triangle Pascal's Triangle
77
123 (avg. 1.6)
49 (63.6%)
12 (15.6%)
Knapsack Knapsack
44
85 (avg. 1.9)
19 (43.2%)
6 (13.6%)
Binary Search Binary Search
77
132 (avg. 1.7)
41 (53.2%)
5 (6.5%)
Two Fer Two Fer
142
224 (avg. 1.6)
102 (71.8%)
10 (7.0%)
Transpose Transpose
65
86 (avg. 1.3)
36 (55.4%)
3 (4.6%)
Forth Forth
44
76 (avg. 1.7)
17 (38.6%)
1 (2.3%)
Phone Number Phone Number
58
89 (avg. 1.5)
44 (75.9%)
3 (5.2%)
Raindrops Raindrops
90
131 (avg. 1.5)
79 (87.8%)
9 (10.0%)
Matching Brackets Matching Brackets
35
68 (avg. 1.9)
26 (74.3%)
2 (5.7%)
Perfect Numbers Perfect Numbers
34
62 (avg. 1.8)
24 (70.6%)
2 (5.9%)
Nucleotide Count Nucleotide Count
70
78 (avg. 1.1)
52 (74.3%)
3 (4.3%)
Scrabble Score Scrabble Score
61
81 (avg. 1.3)
46 (75.4%)
5 (8.2%)
Word Count Word Count
51
72 (avg. 1.4)
26 (51.0%)
4 (7.8%)
Pangram Pangram
31
71 (avg. 2.3)
22 (71.0%)
2 (6.5%)
Queen Attack Queen Attack
27
45 (avg. 1.7)
20 (74.1%)
2 (7.4%)
Atbash Cipher Atbash Cipher
36
42 (avg. 1.2)
24 (66.7%)
1 (2.8%)
Change Change
19
22 (avg. 1.2)
8 (42.1%)
2 (10.5%)
Collatz Conjecture Collatz Conjecture
35
71 (avg. 2.0)
27 (77.1%)
1 (2.9%)
Rotational Cipher Rotational Cipher
26
25 (avg. 1.0)
18 (69.2%)
0 (0.0%)
Prime Factors Prime Factors
23
19 (avg. 0.8)
12 (52.2%)
1 (4.3%)
Bob Bob
75
85 (avg. 1.1)
58 (77.3%)
8 (10.7%)
Affine Cipher Affine Cipher
22
47 (avg. 2.1)
14 (63.6%)
2 (9.1%)
Accumulate Accumulate
34
142 (avg. 4.2)
17 (50.0%)
0 (0.0%)
Armstrong Numbers Armstrong Numbers
32
55 (avg. 1.7)
21 (65.6%)
0 (0.0%)
Acronym Acronym
28
68 (avg. 2.4)
16 (57.1%)
0 (0.0%)
Octal Octal
20
18 (avg. 0.9)
14 (70.0%)
0 (0.0%)
Roman Numerals Roman Numerals
28
37 (avg. 1.3)
16 (57.1%)
0 (0.0%)
Strain Strain
26
69 (avg. 2.7)
20 (76.9%)
0 (0.0%)
Sum of Multiples Sum of Multiples
31
60 (avg. 1.9)
19 (61.3%)
0 (0.0%)
Triangle Triangle
35
213 (avg. 6.1)
22 (62.9%)
0 (0.0%)
Trinary Trinary
27
55 (avg. 2.0)
16 (59.3%)
0 (0.0%)
Sieve Sieve
37
128 (avg. 3.5)
16 (43.2%)
3 (8.1%)
2 deprecated practice exercises
Started
Attempts
Completions
Mentoring requests
List Ops List Ops
37
38 (avg. 1.0)
24 (64.9%)
3 (8.1%)
Robot Name Robot Name
28
41 (avg. 1.5)
24 (85.7%)
3 (10.7%)
90 unimplemented practice exercises
All Your Base All Your Base
Allergies Allergies
Alphametics Alphametics
Bank Account Bank Account
Binary Search Tree Binary Search Tree
Book Store Book Store
Bottle Song Bottle Song
Bowling Bowling
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
Dominoes Dominoes
ETL ETL
Error Handling Error Handling
Flatten Array Flatten Array
Food Chain Food Chain
Gigasecond Gigasecond
Go Counting Go Counting
Grade School Grade School
Grep Grep
Hangman Hangman
High Scores High Scores
House House
ISBN Verifier ISBN Verifier
Isogram Isogram
Killer Sudoku Helper Killer Sudoku Helper
Kindergarten Garden Kindergarten Garden
Largest Series Product Largest Series Product
Ledger Ledger
Lens Person Lens Person
Linked List Linked List
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
Parallel Letter Frequency Parallel Letter Frequency
Pig Latin Pig Latin
Poker Poker
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 Simulator Robot Simulator
Run-Length Encoding Run-Length Encoding
SGF Parsing SGF Parsing
Saddle Points Saddle Points
Satellite Satellite
Say Say
Scale Generator Scale Generator
Secret Handshake Secret Handshake
Series Series
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
Sublist Sublist
Tournament Tournament
Tree Building Tree Building
Twelve Days Twelve Days
Two Bucket Two Bucket
Variable Length Quantity Variable Length Quantity
Word Search Word Search
Wordy Wordy
Yacht Yacht
Zebra Puzzle Zebra Puzzle
Zipper Zipper