Scheme

3,255 students

28 contributors

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

28 contributors

Build Test Runners

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

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

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

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

1,891

3,243 (avg. 1.7)

1,269 (67.1%)

3 (0.2%)

Leap

835

2,530 (avg. 3.0)

471 (56.4%)

95 (11.4%)

RNA Transcription

407

1,777 (avg. 4.4)

220 (54.1%)

49 (12.0%)

Hamming

363

970 (avg. 2.7)

234 (64.5%)

59 (16.3%)

Grains

248

1,082 (avg. 4.4)

190 (76.6%)

32 (12.9%)

Anagram

135

413 (avg. 3.1)

91 (67.4%)

15 (11.1%)

Difference of Squares

175

378 (avg. 2.2)

141 (80.6%)

20 (11.4%)

Pascal's Triangle

87

136 (avg. 1.6)

55 (63.2%)

12 (13.8%)

Knapsack

49

97 (avg. 2.0)

21 (42.9%)

6 (12.2%)

Binary Search

86

185 (avg. 2.2)

45 (52.3%)

5 (5.8%)

Two Fer

159

276 (avg. 1.7)

119 (74.8%)

10 (6.3%)

Transpose

68

90 (avg. 1.3)

39 (57.4%)

3 (4.4%)

Forth

49

88 (avg. 1.8)

19 (38.8%)

2 (4.1%)

Phone Number

59

90 (avg. 1.5)

45 (76.3%)

3 (5.1%)

Raindrops

93

135 (avg. 1.5)

82 (88.2%)

9 (9.7%)

Matching Brackets

37

70 (avg. 1.9)

27 (73.0%)

2 (5.4%)

Perfect Numbers

36

66 (avg. 1.8)

26 (72.2%)

2 (5.6%)

Nucleotide Count

73

80 (avg. 1.1)

53 (72.6%)

3 (4.1%)

Scrabble Score

68

103 (avg. 1.5)

53 (77.9%)

5 (7.4%)

Word Count

55

74 (avg. 1.3)

28 (50.9%)

4 (7.3%)

Pangram

37

84 (avg. 2.3)

25 (67.6%)

2 (5.4%)

Queen Attack

31

51 (avg. 1.6)

23 (74.2%)

2 (6.5%)

Atbash Cipher

39

45 (avg. 1.2)

27 (69.2%)

1 (2.6%)

Change

21

29 (avg. 1.4)

10 (47.6%)

2 (9.5%)

Collatz Conjecture

46

89 (avg. 1.9)

36 (78.3%)

1 (2.2%)

Rotational Cipher

29

29 (avg. 1.0)

21 (72.4%)

0 (0.0%)

Prime Factors

26

22 (avg. 0.8)

13 (50.0%)

1 (3.8%)

Bob

77

86 (avg. 1.1)

59 (76.6%)

8 (10.4%)

Affine Cipher

23

52 (avg. 2.3)

15 (65.2%)

2 (8.7%)

Accumulate

46

257 (avg. 5.6)

20 (43.5%)

0 (0.0%)

Armstrong Numbers

36

62 (avg. 1.7)

24 (66.7%)

0 (0.0%)

Acronym

32

83 (avg. 2.6)

19 (59.4%)

0 (0.0%)

Octal

23

27 (avg. 1.2)

17 (73.9%)

1 (4.3%)

Roman Numerals

29

39 (avg. 1.3)

17 (58.6%)

0 (0.0%)

Strain

29

74 (avg. 2.6)

23 (79.3%)

0 (0.0%)

Sum of Multiples

39

88 (avg. 2.3)

21 (53.8%)

0 (0.0%)

Triangle

43

250 (avg. 5.8)

28 (65.1%)

0 (0.0%)

Trinary

31

68 (avg. 2.2)

19 (61.3%)

0 (0.0%)

Sieve

40

177 (avg. 4.4)

18 (45.0%)

3 (7.5%)

2 deprecated practice exercises

Started

Attempts

Completions

Mentoring requests

List Ops

37

38 (avg. 1.0)

24 (64.9%)

3 (8.1%)

Robot Name

28

41 (avg. 1.5)

24 (85.7%)

3 (10.7%)

90 unimplemented practice exercises

All Your Base

Allergies

Alphametics

Bank Account

Binary Search Tree

Book Store

Bottle Song

Bowling

Circular Buffer

Clock

Complex Numbers

Connect

Crypto Square

Custom Set

D&D Character

DOT DSL

Darts

Diamond

Dominoes

ETL

Error Handling

Flatten Array

Food Chain

Gigasecond

Go Counting

Grade School

Grep

Hangman

High Scores

House

ISBN Verifier

Isogram

Killer Sudoku Helper

Kindergarten Garden

Largest Series Product

Ledger

Lens Person

Linked List

Luhn

Markdown

Matrix

Meetup

Micro Blog

Minesweeper

Nth Prime

OCR Numbers

POV

PaaS I/O

Palindrome Products

Parallel Letter Frequency

Pig Latin

Poker

Protein Translation

Proverb

Pythagorean Triplet

REST API

Rail Fence Cipher

Rational Numbers

React

Rectangles

Resistor Color

Resistor Color Duo

Resistor Color Trio

Reverse String

Robot Simulator

Run-Length Encoding

SGF Parsing

Saddle Points

Satellite

Say

Scale Generator

Secret Handshake

Series

Simple Cipher

Simple Linked List

Space Age

Spiral Matrix

Square Root

State of Tic-Tac-Toe

Sublist

Tournament

Tree Building

Twelve Days

Two Bucket

Variable Length Quantity

Word Search

Wordy

Yacht

Zebra Puzzle

Zipper

Volunteers

41

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1,957

guygastineau

813

kytrinyx

574

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