Scala

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Exercises

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233 mentors

15,034
students have developed their Scala skills on Exercism.

Students

15,034

Submissions

118,630

Mentoring Discussions

6,732

The Scala track needs attention ⚠️

Building

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58 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

93,997

Test Run Pass Rate

34.3% (32249)

Test Run Fail Rate

14.6% (13765)

Test Run Error Rate

51.0% (47983)

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

92 active practice exercises

Started

Attempts

Completions

Mentoring requests

Hello World

9,011

11,852 (avg. 1.3)

7,557 (83.9%)

86 (1.0%)

Two Fer

4,166

17,348 (avg. 4.2)

2,677 (64.3%)

650 (15.6%)

Leap

3,954

7,750 (avg. 2.0)

3,402 (86.0%)

743 (18.8%)

Space Age

2,868

6,381 (avg. 2.2)

2,283 (79.6%)

557 (19.4%)

Grade School

2,330

7,734 (avg. 3.3)

1,591 (68.3%)

449 (19.3%)

Bob

2,974

8,628 (avg. 2.9)

2,466 (82.9%)

596 (20.0%)

Hamming

1,927

4,282 (avg. 2.2)

1,712 (88.8%)

455 (23.6%)

ETL

1,431

2,790 (avg. 1.9)

1,189 (83.1%)

276 (19.3%)

Robot Simulator

1,035

3,151 (avg. 3.0)

733 (70.8%)

184 (17.8%)

Secret Handshake

793

1,837 (avg. 2.3)

613 (77.3%)

153 (19.3%)

Robot Name

1,568

2,527 (avg. 1.6)

914 (58.3%)

186 (11.9%)

Matching Brackets

971

2,163 (avg. 2.2)

559 (57.6%)

77 (7.9%)

Beer Song

762

1,829 (avg. 2.4)

490 (64.3%)

35 (4.6%)

House

610

1,094 (avg. 1.8)

355 (58.2%)

15 (2.5%)

Food Chain

313

388 (avg. 1.2)

155 (49.5%)

6 (1.9%)

Armstrong Numbers

644

1,267 (avg. 2.0)

527 (81.8%)

43 (6.7%)

Collatz Conjecture

859

1,507 (avg. 1.8)

712 (82.9%)

56 (6.5%)

Triangle

567

1,287 (avg. 2.3)

487 (85.9%)

31 (5.5%)

Pascal's Triangle

382

807 (avg. 2.1)

263 (68.8%)

13 (3.4%)

Prime Factors

440

1,210 (avg. 2.8)

313 (71.1%)

22 (5.0%)

Spiral Matrix

230

278 (avg. 1.2)

118 (51.3%)

8 (3.5%)

Nth Prime

253

446 (avg. 1.8)

172 (68.0%)

9 (3.6%)

Forth

204

338 (avg. 1.7)

58 (28.4%)

5 (2.5%)

Clock

409

747 (avg. 1.8)

277 (67.7%)

13 (3.2%)

Meetup

328

401 (avg. 1.2)

259 (79.0%)

8 (2.4%)

Nucleotide Count

627

1,118 (avg. 1.8)

565 (90.1%)

92 (14.7%)

Word Count

910

1,591 (avg. 1.7)

786 (86.4%)

99 (10.9%)

Parallel Letter Frequency

155

327 (avg. 2.1)

85 (54.8%)

13 (8.4%)

Alphametics

138

241 (avg. 1.7)

48 (34.8%)

4 (2.9%)

Lens Person

131

176 (avg. 1.3)

55 (42.0%)

2 (1.5%)

Binary Search

346

716 (avg. 2.1)

248 (71.7%)

10 (2.9%)

Grains

445

1,211 (avg. 2.7)

369 (82.9%)

32 (7.2%)

Phone Number

638

1,150 (avg. 1.8)

560 (87.8%)

62 (9.7%)

RNA Transcription

389

642 (avg. 1.7)

345 (88.7%)

24 (6.2%)

Strain

371

561 (avg. 1.5)

298 (80.3%)

14 (3.8%)

Linked List

163

344 (avg. 2.1)

92 (56.4%)

0 (0.0%)

Queen Attack

189

392 (avg. 2.1)

152 (80.4%)

9 (4.8%)

Simple Cipher

131

142 (avg. 1.1)

75 (57.3%)

2 (1.5%)

Simple Linked List

194

300 (avg. 1.5)

80 (41.2%)

5 (2.6%)

Binary Search Tree

182

279 (avg. 1.5)

113 (62.1%)

12 (6.6%)

Dominoes

179 (avg. 1.9)

42 (43.8%)

0 (0.0%)

Sublist

198

324 (avg. 1.6)

169 (85.4%)

18 (9.1%)

Connect

84 (avg. 0.9)

40 (43.0%)

5 (5.4%)

Say

106

152 (avg. 1.4)

55 (51.9%)

3 (2.8%)

Crypto Square

155

190 (avg. 1.2)

111 (71.6%)

3 (1.9%)

Bowling

158 (avg. 1.7)

37 (39.8%)

0 (0.0%)

Pythagorean Triplet

163

254 (avg. 1.6)

113 (69.3%)

3 (1.8%)

Bank Account

212

301 (avg. 1.4)

145 (68.4%)

20 (9.4%)

Zebra Puzzle

84 (avg. 0.9)

39 (41.9%)

0 (0.0%)

Darts

225

404 (avg. 1.8)

176 (78.2%)

10 (4.4%)

Difference of Squares

643

934 (avg. 1.5)

542 (84.3%)

52 (8.1%)

Gigasecond

633

705 (avg. 1.1)

493 (77.9%)

41 (6.5%)

Sum of Multiples

2,179

3,071 (avg. 1.4)

1,670 (76.6%)

670 (30.7%)

Accumulate

905

1,321 (avg. 1.5)

788 (87.1%)

192 (21.2%)

Flatten Array

657

875 (avg. 1.3)

470 (71.5%)

24 (3.7%)

High Scores

170

297 (avg. 1.7)

132 (77.6%)

2 (1.2%)

Pangram

723

1,173 (avg. 1.6)

629 (87.0%)

106 (14.7%)

Raindrops

435

701 (avg. 1.6)

388 (89.2%)

29 (6.7%)

Isogram

364

520 (avg. 1.4)

299 (82.1%)

20 (5.5%)

Perfect Numbers

493

816 (avg. 1.7)

417 (84.6%)

106 (21.5%)

Protein Translation

247

447 (avg. 1.8)

195 (78.9%)

5 (2.0%)

Scrabble Score

424

727 (avg. 1.7)

376 (88.7%)

29 (6.8%)

Sieve

389

555 (avg. 1.4)

280 (72.0%)

26 (6.7%)

Acronym

196

386 (avg. 2.0)

152 (77.6%)

3 (1.5%)

All Your Base

168

199 (avg. 1.2)

109 (64.9%)

8 (4.8%)

Allergies

269

346 (avg. 1.3)

198 (73.6%)

4 (1.5%)

Anagram

785

1,091 (avg. 1.4)

697 (88.8%)

82 (10.4%)

Diamond

82 (avg. 1.2)

43 (60.6%)

1 (1.4%)

Kindergarten Garden

188

268 (avg. 1.4)

137 (72.9%)

8 (4.3%)

Largest Series Product

190

357 (avg. 1.9)

148 (77.9%)

7 (3.7%)

Matrix

498

620 (avg. 1.2)

392 (78.7%)

75 (15.1%)

Saddle Points

139

149 (avg. 1.1)

101 (72.7%)

3 (2.2%)

Series

283

347 (avg. 1.2)

216 (76.3%)

9 (3.2%)

Atbash Cipher

158

219 (avg. 1.4)

134 (84.8%)

18 (11.4%)

Book Store

259

269 (avg. 1.0)

132 (51.0%)

40 (15.4%)

Custom Set

108

107 (avg. 1.0)

71 (65.7%)

1 (0.9%)

Luhn

171

305 (avg. 1.8)

132 (77.2%)

7 (4.1%)

Roman Numerals

211

251 (avg. 1.2)

157 (74.4%)

15 (7.1%)

Rotational Cipher

87 (avg. 1.1)

52 (66.7%)

0 (0.0%)

Run-Length Encoding

224

349 (avg. 1.6)

181 (80.8%)

23 (10.3%)

Complex Numbers

126

169 (avg. 1.3)

83 (65.9%)

3 (2.4%)

OCR Numbers

108

106 (avg. 1.0)

71 (65.7%)

4 (3.7%)

Palindrome Products

157

237 (avg. 1.5)

97 (61.8%)

7 (4.5%)

Pig Latin

83 (avg. 1.0)

52 (59.8%)

3 (3.4%)

Rail Fence Cipher

78 (avg. 1.1)

43 (61.4%)

0 (0.0%)

Change

115

194 (avg. 1.7)

45 (39.1%)

3 (2.6%)

Minesweeper

112

124 (avg. 1.1)

75 (67.0%)

3 (2.7%)

Wordy

103

173 (avg. 1.7)

69 (67.0%)

4 (3.9%)

Yacht

22 (avg. 7.3)

1 (33.3%)

0 (0.0%)

SGF Parsing

77 (avg. 1.1)

22 (32.4%)

2 (2.9%)

Variable Length Quantity

93 (avg. 1.5)

28 (45.2%)

2 (3.2%)

Zipper

103

144 (avg. 1.4)

45 (43.7%)

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%)

38 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

Volunteers

276

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18.6k

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6,905

ErikSchierboom

3,991

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15,034 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

15,034
students have developed their Scala skills on Exercism.