Scala

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Exercises

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57 contributors

231 mentors

14,907
students have developed their Scala skills on Exercism.

Students

14,907

Submissions

115,141

Mentoring Discussions

6,702

The Scala track needs attention ⚠️

Building

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57 contributors

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

90,535

Test Run Pass Rate

34.7% (31444)

Test Run Fail Rate

14.3% (12949)

Test Run Error Rate

51.0% (46142)

Build Analyzers

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Build an Analyzer for Scala: 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 130 practice exercises. Find out more.

Usage statistics

91 active practice exercises

Started

Attempts

Completions

Mentoring requests

Hello World

8,888

11,583 (avg. 1.3)

7,454 (83.9%)

86 (1.0%)

Two Fer

4,080

16,957 (avg. 4.2)

2,623 (64.3%)

644 (15.8%)

Leap

3,898

7,550 (avg. 1.9)

3,354 (86.0%)

740 (19.0%)

Space Age

2,821

6,141 (avg. 2.2)

2,249 (79.7%)

555 (19.7%)

Grade School

2,298

7,434 (avg. 3.2)

1,575 (68.5%)

447 (19.5%)

Bob

2,952

8,268 (avg. 2.8)

2,453 (83.1%)

596 (20.2%)

Hamming

1,910

4,142 (avg. 2.2)

1,696 (88.8%)

454 (23.8%)

ETL

1,414

2,708 (avg. 1.9)

1,174 (83.0%)

275 (19.4%)

Robot Simulator

1,027

3,090 (avg. 3.0)

726 (70.7%)

182 (17.7%)

Secret Handshake

775

1,714 (avg. 2.2)

602 (77.7%)

153 (19.7%)

Robot Name

1,554

2,461 (avg. 1.6)

904 (58.2%)

185 (11.9%)

Matching Brackets

954

2,027 (avg. 2.1)

553 (58.0%)

77 (8.1%)

Beer Song

751

1,739 (avg. 2.3)

482 (64.2%)

35 (4.7%)

House

600

1,046 (avg. 1.7)

350 (58.3%)

15 (2.5%)

Food Chain

311

386 (avg. 1.2)

153 (49.2%)

6 (1.9%)

Armstrong Numbers

638

1,213 (avg. 1.9)

521 (81.7%)

42 (6.6%)

Collatz Conjecture

854

1,464 (avg. 1.7)

705 (82.6%)

55 (6.4%)

Triangle

561

1,220 (avg. 2.2)

483 (86.1%)

30 (5.3%)

Pascal's Triangle

370

733 (avg. 2.0)

253 (68.4%)

12 (3.2%)

Prime Factors

436

1,178 (avg. 2.7)

312 (71.6%)

22 (5.0%)

Spiral Matrix

221

241 (avg. 1.1)

113 (51.1%)

6 (2.7%)

Nth Prime

252

444 (avg. 1.8)

171 (67.9%)

9 (3.6%)

Forth

201

332 (avg. 1.7)

56 (27.9%)

5 (2.5%)

Clock

399

714 (avg. 1.8)

276 (69.2%)

13 (3.3%)

Meetup

327

398 (avg. 1.2)

258 (78.9%)

8 (2.4%)

Nucleotide Count

623

1,116 (avg. 1.8)

563 (90.4%)

92 (14.8%)

Word Count

907

1,584 (avg. 1.7)

783 (86.3%)

98 (10.8%)

Parallel Letter Frequency

155

327 (avg. 2.1)

85 (54.8%)

13 (8.4%)

Alphametics

137

241 (avg. 1.8)

48 (35.0%)

4 (2.9%)

Lens Person

129

176 (avg. 1.4)

55 (42.6%)

2 (1.6%)

Binary Search

341

668 (avg. 2.0)

245 (71.8%)

10 (2.9%)

Grains

440

1,112 (avg. 2.5)

364 (82.7%)

30 (6.8%)

Phone Number

636

1,145 (avg. 1.8)

559 (87.9%)

62 (9.7%)

RNA Transcription

386

603 (avg. 1.6)

342 (88.6%)

23 (6.0%)

Strain

368

559 (avg. 1.5)

297 (80.7%)

14 (3.8%)

Linked List

160

336 (avg. 2.1)

90 (56.3%)

0 (0.0%)

Queen Attack

188

390 (avg. 2.1)

152 (80.9%)

9 (4.8%)

Simple Cipher

130

140 (avg. 1.1)

74 (56.9%)

2 (1.5%)

Simple Linked List

192

299 (avg. 1.6)

79 (41.1%)

5 (2.6%)

Binary Search Tree

181

277 (avg. 1.5)

112 (61.9%)

12 (6.6%)

Dominoes

178 (avg. 1.9)

41 (43.2%)

0 (0.0%)

Sublist

197

323 (avg. 1.6)

168 (85.3%)

18 (9.1%)

Connect

83 (avg. 0.9)

39 (42.4%)

5 (5.4%)

Say

105

151 (avg. 1.4)

54 (51.4%)

3 (2.9%)

Crypto Square

154

189 (avg. 1.2)

110 (71.4%)

3 (1.9%)

Bowling

157 (avg. 1.7)

36 (39.1%)

0 (0.0%)

Pythagorean Triplet

161

251 (avg. 1.6)

112 (69.6%)

3 (1.9%)

Bank Account

210

300 (avg. 1.4)

144 (68.6%)

20 (9.5%)

Zebra Puzzle

83 (avg. 0.9)

38 (41.8%)

0 (0.0%)

Darts

222

380 (avg. 1.7)

173 (77.9%)

9 (4.1%)

Difference of Squares

640

916 (avg. 1.4)

539 (84.2%)

51 (8.0%)

Gigasecond

631

698 (avg. 1.1)

492 (78.0%)

41 (6.5%)

Sum of Multiples

2,176

3,056 (avg. 1.4)

1,667 (76.6%)

669 (30.7%)

Accumulate

903

1,318 (avg. 1.5)

785 (86.9%)

192 (21.3%)

Flatten Array

654

859 (avg. 1.3)

468 (71.6%)

24 (3.7%)

High Scores

168

293 (avg. 1.7)

129 (76.8%)

2 (1.2%)

Pangram

719

1,145 (avg. 1.6)

625 (86.9%)

105 (14.6%)

Raindrops

431

670 (avg. 1.6)

384 (89.1%)

28 (6.5%)

Isogram

361

496 (avg. 1.4)

295 (81.7%)

19 (5.3%)

Perfect Numbers

491

808 (avg. 1.6)

415 (84.5%)

106 (21.6%)

Protein Translation

245

443 (avg. 1.8)

193 (78.8%)

5 (2.0%)

Scrabble Score

420

708 (avg. 1.7)

372 (88.6%)

28 (6.7%)

Sieve

380

492 (avg. 1.3)

274 (72.1%)

26 (6.8%)

Acronym

195

385 (avg. 2.0)

151 (77.4%)

3 (1.5%)

All Your Base

167

197 (avg. 1.2)

108 (64.7%)

8 (4.8%)

Allergies

261

296 (avg. 1.1)

193 (73.9%)

4 (1.5%)

Anagram

784

1,090 (avg. 1.4)

696 (88.8%)

82 (10.5%)

Diamond

81 (avg. 1.2)

42 (60.0%)

1 (1.4%)

Kindergarten Garden

187

256 (avg. 1.4)

136 (72.7%)

8 (4.3%)

Largest Series Product

188

343 (avg. 1.8)

147 (78.2%)

7 (3.7%)

Matrix

497

619 (avg. 1.2)

391 (78.7%)

75 (15.1%)

Saddle Points

138

148 (avg. 1.1)

100 (72.5%)

3 (2.2%)

Series

281

344 (avg. 1.2)

215 (76.5%)

9 (3.2%)

Atbash Cipher

157

218 (avg. 1.4)

133 (84.7%)

18 (11.5%)

Book Store

258

266 (avg. 1.0)

131 (50.8%)

40 (15.5%)

Custom Set

107

105 (avg. 1.0)

70 (65.4%)

1 (0.9%)

Luhn

170

304 (avg. 1.8)

131 (77.1%)

7 (4.1%)

Roman Numerals

210

250 (avg. 1.2)

156 (74.3%)

15 (7.1%)

Rotational Cipher

86 (avg. 1.1)

51 (66.2%)

0 (0.0%)

Run-Length Encoding

223

347 (avg. 1.6)

180 (80.7%)

23 (10.3%)

Complex Numbers

124

166 (avg. 1.3)

82 (66.1%)

3 (2.4%)

OCR Numbers

107

105 (avg. 1.0)

70 (65.4%)

4 (3.7%)

Palindrome Products

156

235 (avg. 1.5)

96 (61.5%)

7 (4.5%)

Pig Latin

77 (avg. 0.9)

51 (60.0%)

3 (3.5%)

Rail Fence Cipher

77 (avg. 1.1)

42 (61.8%)

0 (0.0%)

Change

114

193 (avg. 1.7)

44 (38.6%)

3 (2.6%)

Minesweeper

110

121 (avg. 1.1)

73 (66.4%)

3 (2.7%)

Wordy

102

172 (avg. 1.7)

68 (66.7%)

4 (3.9%)

SGF Parsing

77 (avg. 1.1)

22 (32.8%)

2 (3.0%)

Variable Length Quantity

93 (avg. 1.5)

28 (45.9%)

2 (3.3%)

Zipper

102

143 (avg. 1.4)

44 (43.1%)

4 (3.9%)

4 deprecated practice exercises

Started

Attempts

Completions

Mentoring requests

Binary

107 (avg. 1.6)

65 (100.0%)

10 (15.4%)

Hexadecimal

39 (avg. 1.3)

31 (100.0%)

2 (6.5%)

Octal

29 (avg. 1.4)

21 (100.0%)

1 (4.8%)

Trinary

19 (avg. 1.1)

18 (100.0%)

0 (0.0%)

39 unimplemented practice exercises

Affine Cipher

Bottle Song

Circular Buffer

D&D Character

DOT DSL

Error Handling

Go Counting

Grep

Hangman

ISBN Verifier

Killer Sudoku Helper

Knapsack

Ledger

List Ops

Markdown

Micro Blog

POV

PaaS I/O

Poker

Proverb

REST API

Rational Numbers

React

Rectangles

Resistor Color

Resistor Color Duo

Resistor Color Trio

Reverse String

Satellite

Scale Generator

Square Root

State of Tic-Tac-Toe

Tournament

Transpose

Tree Building

Twelve Days

Two Bucket

Word Search

Yacht

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3,985

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14,907 students have developed their Scala skills on Exercism.

The Scala track needs attention ⚠️

Build

Build Test Runners

Usage statistics

Build Analyzers

Build Representers

Create Practice Exercises

Usage statistics

We 💙 our volunteers

14,907
students have developed their Scala skills on Exercism.