Scheme

3,341 students

28 contributors

3,341
students have developed their Scheme skills on Exercism.

Students

3,341

Submissions

15,300

Mentoring Discussions

360

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

13,150

Test Run Pass Rate

28.9% (3795)

Test Run Fail Rate

43.7% (5749)

Test Run Error Rate

27.4% (3606)

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

1,964

3,338 (avg. 1.7)

1,336 (68.0%)

3 (0.2%)

Leap

890

2,798 (avg. 3.1)

515 (57.9%)

98 (11.0%)

RNA Transcription

440

1,905 (avg. 4.3)

239 (54.3%)

49 (11.1%)

Hamming

379

1,071 (avg. 2.8)

246 (64.9%)

60 (15.8%)

Grains

270

1,261 (avg. 4.7)

206 (76.3%)

33 (12.2%)

Anagram

144

425 (avg. 3.0)

97 (67.4%)

15 (10.4%)

Difference of Squares

200

478 (avg. 2.4)

162 (81.0%)

20 (10.0%)

Pascal's Triangle

92

140 (avg. 1.5)

59 (64.1%)

12 (13.0%)

Knapsack

53

104 (avg. 2.0)

23 (43.4%)

6 (11.3%)

Binary Search

96

252 (avg. 2.6)

53 (55.2%)

5 (5.2%)

Two Fer

183

366 (avg. 2.0)

141 (77.0%)

11 (6.0%)

Transpose

75

100 (avg. 1.3)

43 (57.3%)

3 (4.0%)

Forth

55

91 (avg. 1.7)

20 (36.4%)

2 (3.6%)

Phone Number

64

94 (avg. 1.5)

49 (76.6%)

3 (4.7%)

Raindrops

100

141 (avg. 1.4)

88 (88.0%)

9 (9.0%)

Matching Brackets

55

235 (avg. 4.3)

40 (72.7%)

2 (3.6%)

Perfect Numbers

40

80 (avg. 2.0)

30 (75.0%)

2 (5.0%)

Nucleotide Count

81

106 (avg. 1.3)

58 (71.6%)

3 (3.7%)

Scrabble Score

75

119 (avg. 1.6)

59 (78.7%)

5 (6.7%)

Word Count

58

80 (avg. 1.4)

32 (55.2%)

4 (6.9%)

Pangram

44

104 (avg. 2.4)

31 (70.5%)

2 (4.5%)

Queen Attack

39

65 (avg. 1.7)

29 (74.4%)

2 (5.1%)

Atbash Cipher

45

70 (avg. 1.6)

32 (71.1%)

1 (2.2%)

Change

25

35 (avg. 1.4)

13 (52.0%)

2 (8.0%)

Collatz Conjecture

55

105 (avg. 1.9)

44 (80.0%)

2 (3.6%)

Rotational Cipher

36

45 (avg. 1.3)

27 (75.0%)

0 (0.0%)

Prime Factors

32

37 (avg. 1.2)

19 (59.4%)

1 (3.1%)

Bob

83

90 (avg. 1.1)

63 (75.9%)

8 (9.6%)

Affine Cipher

27

55 (avg. 2.0)

18 (66.7%)

2 (7.4%)

Accumulate

51

323 (avg. 6.3)

20 (39.2%)

0 (0.0%)

Armstrong Numbers

43

86 (avg. 2.0)

29 (67.4%)

0 (0.0%)

Acronym

39

124 (avg. 3.2)

25 (64.1%)

0 (0.0%)

Octal

29

51 (avg. 1.8)

23 (79.3%)

1 (3.4%)

Roman Numerals

35

60 (avg. 1.7)

22 (62.9%)

0 (0.0%)

Strain

36

98 (avg. 2.7)

28 (77.8%)

0 (0.0%)

Sum of Multiples

45

131 (avg. 2.9)

26 (57.8%)

0 (0.0%)

Triangle

49

268 (avg. 5.5)

33 (67.3%)

0 (0.0%)

Trinary

41

100 (avg. 2.4)

25 (61.0%)

0 (0.0%)

Sieve

46

190 (avg. 4.1)

22 (47.8%)

4 (8.7%)

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

42

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1,957

guygastineau

813

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574

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