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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.

Synced primary repo: 7858017e08371dc07fb048a13cdf01e9ab5159e7 (Updates should be instant)

Next goal: Implement 135 practice exercises. Find out more.

103 active practice exercises

Started

Attempts

Completions

Mentoring requests

Hello World

712

1,004 (avg. 1.4)

612 (86.0%)

0 (0.0%)

Bob

76

565 (avg. 7.4)

37 (48.7%)

1 (1.3%)

Grains

117

1,109 (avg. 9.5)

89 (76.1%)

4 (3.4%)

Hamming

64

209 (avg. 3.3)

55 (85.9%)

0 (0.0%)

Isogram

67

341 (avg. 5.1)

56 (83.6%)

0 (0.0%)

Leap

375

1,053 (avg. 2.8)

279 (74.4%)

9 (2.4%)

Nucleotide Count

67

292 (avg. 4.4)

56 (83.6%)

2 (3.0%)

Pangram

98

628 (avg. 6.4)

82 (83.7%)

1 (1.0%)

Raindrops

79

234 (avg. 3.0)

66 (83.5%)

2 (2.5%)

Resistor Color

56

156 (avg. 2.8)

46 (82.1%)

1 (1.8%)

Reverse String

228

669 (avg. 2.9)

197 (86.4%)

4 (1.8%)

Scrabble Score

55

194 (avg. 3.5)

47 (85.5%)

1 (1.8%)

Triangle

112

468 (avg. 4.2)

97 (86.6%)

2 (1.8%)

Two-Fer

79

179 (avg. 2.3)

70 (88.6%)

2 (2.5%)

Accumulate

56

121 (avg. 2.2)

48 (85.7%)

0 (0.0%)

Acronym

28

153 (avg. 5.5)

23 (82.1%)

0 (0.0%)

Allergies

16

98 (avg. 6.1)

12 (75.0%)

0 (0.0%)

Collatz Conjecture

202

1,323 (avg. 6.5)

159 (78.7%)

7 (3.5%)

Darts

80

314 (avg. 3.9)

63 (78.8%)

2 (2.5%)

Difference of Squares

19

41 (avg. 2.2)

17 (89.5%)

1 (5.3%)

ETL

17

66 (avg. 3.9)

15 (88.2%)

0 (0.0%)

Gigasecond

27

67 (avg. 2.5)

22 (81.5%)

1 (3.7%)

High Scores

14

28 (avg. 2.0)

12 (85.7%)

0 (0.0%)

Kindergarten Garden

40

153 (avg. 3.8)

30 (75.0%)

1 (2.5%)

Luhn

54

389 (avg. 7.2)

42 (77.8%)

1 (1.9%)

Micro Blog

22

86 (avg. 3.9)

18 (81.8%)

0 (0.0%)

Resistor Color Duo

19

42 (avg. 2.2)

17 (89.5%)

0 (0.0%)

Sum of Multiples

27

123 (avg. 4.6)

22 (81.5%)

0 (0.0%)

Anagram

11

60 (avg. 5.5)

10 (90.9%)

0 (0.0%)

Armstrong Numbers

18

88 (avg. 4.9)

17 (94.4%)

0 (0.0%)

Binary Search

38

238 (avg. 6.3)

30 (78.9%)

0 (0.0%)

Eliud's Eggs

25

45 (avg. 1.8)

22 (88.0%)

0 (0.0%)

ISBN Verifier

26

103 (avg. 4.0)

20 (76.9%)

2 (7.7%)

Pascal's Triangle

23

83 (avg. 3.6)

18 (78.3%)

1 (4.3%)

Perfect Numbers

14

49 (avg. 3.5)

13 (92.9%)

0 (0.0%)

Phone Number

20

140 (avg. 7.0)

15 (75.0%)

0 (0.0%)

Protein Translation

38

183 (avg. 4.8)

29 (76.3%)

1 (2.6%)

Proverb

4

3 (avg. 0.8)

3 (75.0%)

0 (0.0%)

Pythagorean Triplet

25

62 (avg. 2.5)

17 (68.0%)

0 (0.0%)

RNA Transcription

26

119 (avg. 4.6)

24 (92.3%)

0 (0.0%)

Roman Numerals

13

90 (avg. 6.9)

12 (92.3%)

0 (0.0%)

Run-Length Encoding

15

46 (avg. 3.1)

10 (66.7%)

0 (0.0%)

Secret Handshake

39

333 (avg. 8.5)

30 (76.9%)

1 (2.6%)

Series

11

47 (avg. 4.3)

10 (90.9%)

0 (0.0%)

Square Root

19

82 (avg. 4.3)

14 (73.7%)

0 (0.0%)

Strain

13

18 (avg. 1.4)

12 (92.3%)

0 (0.0%)

Sublist

17

47 (avg. 2.8)

14 (82.4%)

0 (0.0%)

Twelve Days

4

5 (avg. 1.3)

3 (75.0%)

0 (0.0%)

Word Count

3

13 (avg. 4.3)

2 (66.7%)

0 (0.0%)

Affine Cipher

13

51 (avg. 3.9)

7 (53.8%)

0 (0.0%)

All Your Base

14

69 (avg. 4.9)

11 (78.6%)

0 (0.0%)

Atbash Cipher

14

62 (avg. 4.4)

11 (78.6%)

0 (0.0%)

Bottle Song

4

4 (avg. 1.0)

2 (50.0%)

0 (0.0%)

Circular Buffer

15

39 (avg. 2.6)

9 (60.0%)

0 (0.0%)

Clock

39

311 (avg. 8.0)

29 (74.4%)

0 (0.0%)

Crypto Square

11

108 (avg. 9.8)

6 (54.5%)

0 (0.0%)

Diamond

12

20 (avg. 1.7)

7 (58.3%)

0 (0.0%)

Conway's Game of Life

9

14 (avg. 1.6)

6 (66.7%)

0 (0.0%)

House

3

4 (avg. 1.3)

2 (66.7%)

0 (0.0%)

Killer Sudoku Helper

9

10 (avg. 1.1)

4 (44.4%)

0 (0.0%)

Largest Series Product

16

54 (avg. 3.4)

12 (75.0%)

0 (0.0%)

Matching Brackets

17

83 (avg. 4.9)

14 (82.4%)

0 (0.0%)

Matrix

8

10 (avg. 1.3)

6 (75.0%)

0 (0.0%)

Minesweeper

12

31 (avg. 2.6)

9 (75.0%)

0 (0.0%)

Nth Prime

48

295 (avg. 6.1)

33 (68.8%)

1 (2.1%)

Pig Latin

9

71 (avg. 7.9)

6 (66.7%)

1 (11.1%)

Prime Factors

39

144 (avg. 3.7)

34 (87.2%)

1 (2.6%)

Rational Numbers

14

105 (avg. 7.5)

9 (64.3%)

0 (0.0%)

Resistor Color Trio

3

4 (avg. 1.3)

2 (66.7%)

0 (0.0%)

Rotational Cipher

13

42 (avg. 3.2)

11 (84.6%)

0 (0.0%)

Saddle Points

11

33 (avg. 3.0)

7 (63.6%)

0 (0.0%)

Sieve

47

233 (avg. 5.0)

39 (83.0%)

1 (2.1%)

Space Age

108

518 (avg. 4.8)

96 (88.9%)

3 (2.8%)

Spiral Matrix

10

26 (avg. 2.6)

6 (60.0%)

1 (10.0%)

Transpose

3

9 (avg. 3.0)

2 (66.7%)

0 (0.0%)

Yacht

8

12 (avg. 1.5)

6 (75.0%)

0 (0.0%)

Complex Numbers

14

60 (avg. 4.3)

10 (71.4%)

1 (7.1%)

Custom Set

17

217 (avg. 12.8)

11 (64.7%)

0 (0.0%)

Food Chain

3

5 (avg. 1.7)

2 (66.7%)

0 (0.0%)

Grade School

48

635 (avg. 13.2)

31 (64.6%)

1 (2.1%)

Knapsack

13

49 (avg. 3.8)

7 (53.8%)

0 (0.0%)

Meetup

30

259 (avg. 8.6)

20 (66.7%)

1 (3.3%)

Parallel Letter Frequency

10

65 (avg. 6.5)

6 (60.0%)

0 (0.0%)

Rail Fence Cipher

10

87 (avg. 8.7)

7 (70.0%)

0 (0.0%)

Rectangles

9

35 (avg. 3.9)

4 (44.4%)

0 (0.0%)

Simple Linked List

33

303 (avg. 9.2)

20 (60.6%)

1 (3.0%)

State of Tic-Tac-Toe

5

14 (avg. 2.8)

3 (60.0%)

0 (0.0%)

Two Bucket

50

364 (avg. 7.3)

42 (84.0%)

0 (0.0%)

Variable Length Quantity

16

32 (avg. 2.0)

7 (43.8%)

0 (0.0%)

Bowling

17

281 (avg. 16.5)

6 (35.3%)

0 (0.0%)

Change

11

188 (avg. 17.1)

6 (54.5%)

0 (0.0%)

Linked List

20

119 (avg. 6.0)

9 (45.0%)

0 (0.0%)

List Ops

25

249 (avg. 10.0)

19 (76.0%)

1 (4.0%)

Palindrome Products

10

59 (avg. 5.9)

8 (80.0%)

0 (0.0%)

Say

8

97 (avg. 12.1)

5 (62.5%)

0 (0.0%)

Wordy

12

77 (avg. 6.4)

7 (58.3%)

0 (0.0%)

Book Store

8

16 (avg. 2.0)

4 (50.0%)

0 (0.0%)

Dominoes

5

19 (avg. 3.8)

3 (60.0%)

0 (0.0%)

Word Search

10

48 (avg. 4.8)

6 (60.0%)

0 (0.0%)

Connect

10

88 (avg. 8.8)

5 (50.0%)

0 (0.0%)

Queen Attack

45

309 (avg. 6.9)

37 (82.2%)

1 (2.2%)

Robot Name

46

297 (avg. 6.5)

34 (73.9%)

1 (2.2%)

Zebra Puzzle

9

27 (avg. 3.0)

5 (55.6%)

0 (0.0%)

32 unimplemented practice exercises

Alphametics

Baffling Birthdays

Bank Account

Binary Search Tree

D&D Character

DOT DSL

Error Handling

Flatten Array

Forth

Go Counting

Grep

Hangman

Intergalactic Transmission

Ledger

Lens Person

Markdown

OCR Numbers

PaaS I/O

Poker

POV

React

Relative Distance

REST API

Robot Simulator

Satellite

SGF Parsing

Simple Cipher

Split-Second Stopwatch

Swift Scheduling

Tournament

Tree Building

Zipper

Programming Tags

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Help manage the tags used to group, filter and recommend solutions, approaches and articles.

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Test Runner

Learn More

Create Test Runners that have the single responsibility of taking a solution, running all tests and returning a standardized output.

Current version: ac0f721a89fd54c45747ec07022c03a11ddf1ac7 (Takes up to 10 mins to deploy)

Next goal: Get Test Runners to Version 2. V is currently utilising a Version 1 Test Runner. Find out more.

Total Test Runner Runs

18,177

Test Run Pass Rate

27.8% (5054)

Test Run Fail Rate

26.7% (4845)

Test Run Error Rate

45.5% (8278)

Representer

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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.

Analyzer

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Build an Analyzer for V: Exercism's analyzers automatically assess student's submissions and provide mentor-style commentary.

Next goal: Build an Analyzer. Find out more.

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