3,254
students have developed their Scheme skills on Exercism.

Students
3,254
Submissions
13,574
Mentoring Discussions
349

The Scheme track needs attention ⚠️

Building

Build

Use your knowledge to build the Scheme track itself

Build Test Runners

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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
11,426
Test Run Pass Rate
28.4% (3243)
Test Run Fail Rate
43.8% (5001)
Test Run Error Rate
27.8% (3182)

Build Analyzers

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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

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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

39 active practice exercises
Started
Attempts
Completions
Mentoring requests
Hello World Hello World
1,891
3,243 (avg. 1.7)
1,269 (67.1%)
3 (0.2%)
Leap Leap
835
2,530 (avg. 3.0)
471 (56.4%)
95 (11.4%)
RNA Transcription RNA Transcription
407
1,777 (avg. 4.4)
220 (54.1%)
49 (12.0%)
Hamming Hamming
363
970 (avg. 2.7)
234 (64.5%)
59 (16.3%)
Grains Grains
248
1,082 (avg. 4.4)
190 (76.6%)
32 (12.9%)
Anagram Anagram
135
413 (avg. 3.1)
91 (67.4%)
15 (11.1%)
Difference of Squares Difference of Squares
175
378 (avg. 2.2)
141 (80.6%)
20 (11.4%)
Pascal's Triangle Pascal's Triangle
87
136 (avg. 1.6)
55 (63.2%)
12 (13.8%)
Knapsack Knapsack
49
97 (avg. 2.0)
21 (42.9%)
6 (12.2%)
Binary Search Binary Search
86
185 (avg. 2.2)
45 (52.3%)
5 (5.8%)
Two Fer Two Fer
159
276 (avg. 1.7)
119 (74.8%)
10 (6.3%)
Transpose Transpose
68
90 (avg. 1.3)
39 (57.4%)
3 (4.4%)
Forth Forth
49
88 (avg. 1.8)
19 (38.8%)
2 (4.1%)
Phone Number Phone Number
59
90 (avg. 1.5)
45 (76.3%)
3 (5.1%)
Raindrops Raindrops
93
135 (avg. 1.5)
82 (88.2%)
9 (9.7%)
Matching Brackets Matching Brackets
37
70 (avg. 1.9)
27 (73.0%)
2 (5.4%)
Perfect Numbers Perfect Numbers
36
66 (avg. 1.8)
26 (72.2%)
2 (5.6%)
Nucleotide Count Nucleotide Count
73
80 (avg. 1.1)
53 (72.6%)
3 (4.1%)
Scrabble Score Scrabble Score
68
103 (avg. 1.5)
53 (77.9%)
5 (7.4%)
Word Count Word Count
55
74 (avg. 1.3)
28 (50.9%)
4 (7.3%)
Pangram Pangram
37
84 (avg. 2.3)
25 (67.6%)
2 (5.4%)
Queen Attack Queen Attack
31
51 (avg. 1.6)
23 (74.2%)
2 (6.5%)
Atbash Cipher Atbash Cipher
39
45 (avg. 1.2)
27 (69.2%)
1 (2.6%)
Change Change
21
29 (avg. 1.4)
10 (47.6%)
2 (9.5%)
Collatz Conjecture Collatz Conjecture
46
89 (avg. 1.9)
36 (78.3%)
1 (2.2%)
Rotational Cipher Rotational Cipher
29
29 (avg. 1.0)
21 (72.4%)
0 (0.0%)
Prime Factors Prime Factors
26
22 (avg. 0.8)
13 (50.0%)
1 (3.8%)
Bob Bob
77
86 (avg. 1.1)
59 (76.6%)
8 (10.4%)
Affine Cipher Affine Cipher
23
52 (avg. 2.3)
15 (65.2%)
2 (8.7%)
Accumulate Accumulate
46
257 (avg. 5.6)
20 (43.5%)
0 (0.0%)
Armstrong Numbers Armstrong Numbers
36
62 (avg. 1.7)
24 (66.7%)
0 (0.0%)
Acronym Acronym
32
83 (avg. 2.6)
19 (59.4%)
0 (0.0%)
Octal Octal
23
27 (avg. 1.2)
17 (73.9%)
1 (4.3%)
Roman Numerals Roman Numerals
29
39 (avg. 1.3)
17 (58.6%)
0 (0.0%)
Strain Strain
29
74 (avg. 2.6)
23 (79.3%)
0 (0.0%)
Sum of Multiples Sum of Multiples
39
88 (avg. 2.3)
21 (53.8%)
0 (0.0%)
Triangle Triangle
43
250 (avg. 5.8)
28 (65.1%)
0 (0.0%)
Trinary Trinary
31
68 (avg. 2.2)
19 (61.3%)
0 (0.0%)
Sieve Sieve
40
177 (avg. 4.4)
18 (45.0%)
3 (7.5%)
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