Scala
Scala
About ScalaPractice

Scala Track Management

This page provides the Exercism community with the information and tools needed to manage the Scala track.

Students
18,339
Submissions
192,461
Mentoring Discussions
6,959

The Scala track needs attention ⚠️

Building

Practice Exercises

Learn More

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: 89311a37e04c2cf86d0a75f9b5094d33f315da6d (Updates should be instant)

Next goal: Implement 136 practice exercises. Find out more.
94 active practice exercises
Started
Attempts
Completions
Mentoring requests
Hello World Hello World
12,399
17,878 (avg. 1.4)
10,227 (82.5%)
86 (0.7%)
Two Fer Two Fer
6,182
27,156 (avg. 4.4)
4,046 (65.4%)
720 (11.6%)
Leap Leap
5,350
13,309 (avg. 2.5)
4,548 (85.0%)
786 (14.7%)
Space Age Space Age
3,953
10,675 (avg. 2.7)
3,144 (79.5%)
575 (14.5%)
Grade School Grade School
3,173
14,857 (avg. 4.7)
2,025 (63.8%)
469 (14.8%)
Bob Bob
3,533
15,100 (avg. 4.3)
2,848 (80.6%)
612 (17.3%)
Hamming Hamming
2,376
6,579 (avg. 2.8)
2,073 (87.2%)
472 (19.9%)
ETL ETL
1,841
4,536 (avg. 2.5)
1,511 (82.1%)
284 (15.4%)
Reverse String Reverse String
436
1,008 (avg. 2.3)
377 (86.5%)
4 (0.9%)
Robot Simulator Robot Simulator
1,369
5,503 (avg. 4.0)
932 (68.1%)
194 (14.2%)
Secret Handshake Secret Handshake
1,073
3,374 (avg. 3.1)
813 (75.8%)
160 (14.9%)
Robot Name Robot Name
1,822
3,761 (avg. 2.1)
1,076 (59.1%)
191 (10.5%)
Matching Brackets Matching Brackets
1,260
3,774 (avg. 3.0)
750 (59.5%)
86 (6.8%)
Beer Song Beer Song
965
3,612 (avg. 3.7)
628 (65.1%)
38 (3.9%)
House House
765
1,902 (avg. 2.5)
434 (56.7%)
15 (2.0%)
Food Chain Food Chain
419
977 (avg. 2.3)
206 (49.2%)
6 (1.4%)
Armstrong Numbers Armstrong Numbers
818
1,965 (avg. 2.4)
671 (82.0%)
44 (5.4%)
Collatz Conjecture Collatz Conjecture
1,031
2,425 (avg. 2.4)
858 (83.2%)
58 (5.6%)
Triangle Triangle
726
2,321 (avg. 3.2)
615 (84.7%)
32 (4.4%)
Pascal's Triangle Pascal's Triangle
503
1,297 (avg. 2.6)
345 (68.6%)
14 (2.8%)
Prime Factors Prime Factors
561
2,142 (avg. 3.8)
397 (70.8%)
25 (4.5%)
Spiral Matrix Spiral Matrix
320
507 (avg. 1.6)
166 (51.9%)
8 (2.5%)
Nth Prime Nth Prime
351
853 (avg. 2.4)
237 (67.5%)
12 (3.4%)
Forth Forth
276
771 (avg. 2.8)
86 (31.2%)
8 (2.9%)
Clock Clock
510
1,274 (avg. 2.5)
335 (65.7%)
15 (2.9%)
Meetup Meetup
393
690 (avg. 1.8)
297 (75.6%)
10 (2.5%)
Nucleotide Count Nucleotide Count
710
1,701 (avg. 2.4)
623 (87.7%)
92 (13.0%)
Word Count Word Count
1,007
2,369 (avg. 2.4)
842 (83.6%)
100 (9.9%)
Parallel Letter Frequency Parallel Letter Frequency
224
527 (avg. 2.4)
115 (51.3%)
14 (6.3%)
Alphametics Alphametics
184
414 (avg. 2.3)
62 (33.7%)
5 (2.7%)
Lens Person Lens Person
178
261 (avg. 1.5)
82 (46.1%)
3 (1.7%)
Binary Search Binary Search
451
1,317 (avg. 2.9)
315 (69.8%)
12 (2.7%)
Grains Grains
540
1,855 (avg. 3.4)
436 (80.7%)
33 (6.1%)
Phone Number Phone Number
730
1,569 (avg. 2.1)
616 (84.4%)
64 (8.8%)
RNA Transcription RNA Transcription
481
1,056 (avg. 2.2)
415 (86.3%)
25 (5.2%)
Strain Strain
441
778 (avg. 1.8)
353 (80.0%)
14 (3.2%)
Linked List Linked List
226
517 (avg. 2.3)
122 (54.0%)
0 (0.0%)
Queen Attack Queen Attack
240
595 (avg. 2.5)
188 (78.3%)
11 (4.6%)
Simple Cipher Simple Cipher
170
287 (avg. 1.7)
97 (57.1%)
2 (1.2%)
Simple Linked List Simple Linked List
236
515 (avg. 2.2)
103 (43.6%)
5 (2.1%)
Binary Search Tree Binary Search Tree
221
580 (avg. 2.6)
136 (61.5%)
12 (5.4%)
Dominoes Dominoes
132
277 (avg. 2.1)
58 (43.9%)
3 (2.3%)
Sublist Sublist
243
444 (avg. 1.8)
191 (78.6%)
18 (7.4%)
Connect Connect
112
127 (avg. 1.1)
48 (42.9%)
5 (4.5%)
Say Say
136
330 (avg. 2.4)
73 (53.7%)
3 (2.2%)
Crypto Square Crypto Square
178
286 (avg. 1.6)
126 (70.8%)
3 (1.7%)
Bowling Bowling
120
219 (avg. 1.8)
51 (42.5%)
0 (0.0%)
Pythagorean Triplet Pythagorean Triplet
193
385 (avg. 2.0)
135 (69.9%)
3 (1.6%)
Bank Account Bank Account
273
449 (avg. 1.6)
178 (65.2%)
20 (7.3%)
Zebra Puzzle Zebra Puzzle
202
813 (avg. 4.0)
108 (53.5%)
0 (0.0%)
Darts Darts
293
543 (avg. 1.9)
232 (79.2%)
10 (3.4%)
Difference of Squares Difference of Squares
704
1,067 (avg. 1.5)
594 (84.4%)
52 (7.4%)
Gigasecond Gigasecond
678
807 (avg. 1.2)
529 (78.0%)
41 (6.0%)
Sum of Multiples Sum of Multiples
2,228
3,231 (avg. 1.5)
1,712 (76.8%)
670 (30.1%)
Accumulate Accumulate
955
1,407 (avg. 1.5)
832 (87.1%)
193 (20.2%)
Flatten Array Flatten Array
729
1,205 (avg. 1.7)
517 (70.9%)
24 (3.3%)
High Scores High Scores
230
534 (avg. 2.3)
176 (76.5%)
2 (0.9%)
Pangram Pangram
788
1,385 (avg. 1.8)
681 (86.4%)
106 (13.5%)
Raindrops Raindrops
499
964 (avg. 1.9)
442 (88.6%)
29 (5.8%)
Isogram Isogram
417
712 (avg. 1.7)
341 (81.8%)
20 (4.8%)
Perfect Numbers Perfect Numbers
537
1,050 (avg. 2.0)
449 (83.6%)
107 (19.9%)
Protein Translation Protein Translation
309
771 (avg. 2.5)
245 (79.3%)
5 (1.6%)
Scrabble Score Scrabble Score
481
882 (avg. 1.8)
419 (87.1%)
29 (6.0%)
Sieve Sieve
431
688 (avg. 1.6)
315 (73.1%)
28 (6.5%)
Acronym Acronym
236
534 (avg. 2.3)
181 (76.7%)
3 (1.3%)
All Your Base All Your Base
195
287 (avg. 1.5)
126 (64.6%)
8 (4.1%)
Allergies Allergies
303
453 (avg. 1.5)
219 (72.3%)
4 (1.3%)
Anagram Anagram
824
1,171 (avg. 1.4)
721 (87.5%)
83 (10.1%)
Diamond Diamond
93
133 (avg. 1.4)
59 (63.4%)
1 (1.1%)
Kindergarten Garden Kindergarten Garden
216
327 (avg. 1.5)
155 (71.8%)
8 (3.7%)
Largest Series Product Largest Series Product
264
723 (avg. 2.7)
206 (78.0%)
7 (2.7%)
Matrix Matrix
530
689 (avg. 1.3)
414 (78.1%)
75 (14.2%)
Saddle Points Saddle Points
162
171 (avg. 1.1)
116 (71.6%)
3 (1.9%)
Series Series
312
438 (avg. 1.4)
238 (76.3%)
9 (2.9%)
Atbash Cipher Atbash Cipher
184
297 (avg. 1.6)
152 (82.6%)
18 (9.8%)
Book Store Book Store
286
437 (avg. 1.5)
144 (50.3%)
40 (14.0%)
Custom Set Custom Set
138
171 (avg. 1.2)
88 (63.8%)
1 (0.7%)
Luhn Luhn
208
535 (avg. 2.6)
156 (75.0%)
8 (3.8%)
Roman Numerals Roman Numerals
242
359 (avg. 1.5)
177 (73.1%)
15 (6.2%)
Rotational Cipher Rotational Cipher
101
116 (avg. 1.1)
65 (64.4%)
0 (0.0%)
Run-Length Encoding Run-Length Encoding
249
391 (avg. 1.6)
194 (77.9%)
23 (9.2%)
Complex Numbers Complex Numbers
148
253 (avg. 1.7)
97 (65.5%)
3 (2.0%)
OCR Numbers OCR Numbers
124
128 (avg. 1.0)
80 (64.5%)
4 (3.2%)
Palindrome Products Palindrome Products
184
401 (avg. 2.2)
108 (58.7%)
8 (4.3%)
Pig Latin Pig Latin
116
160 (avg. 1.4)
67 (57.8%)
4 (3.4%)
Rail Fence Cipher Rail Fence Cipher
88
118 (avg. 1.3)
54 (61.4%)
0 (0.0%)
Change Change
135
247 (avg. 1.8)
56 (41.5%)
3 (2.2%)
Minesweeper Minesweeper
134
208 (avg. 1.6)
87 (64.9%)
3 (2.2%)
Wordy Wordy
129
202 (avg. 1.6)
82 (63.6%)
5 (3.9%)
Yacht Yacht
49
255 (avg. 5.2)
30 (61.2%)
0 (0.0%)
SGF Parsing SGF Parsing
85
288 (avg. 3.4)
30 (35.3%)
6 (7.1%)
Variable Length Quantity Variable Length Quantity
80
115 (avg. 1.4)
35 (43.8%)
2 (2.5%)
Zipper Zipper
135
185 (avg. 1.4)
56 (41.5%)
4 (3.0%)
Circular Buffer Circular Buffer
204
1,311 (avg. 6.4)
162 (79.4%)
1 (0.5%)
4 deprecated practice exercises
Started
Attempts
Completions
Mentoring requests
Binary Binary
65
107 (avg. 1.6)
65 (100.0%)
10 (15.4%)
Hexadecimal Hexadecimal
31
39 (avg. 1.3)
31 (100.0%)
2 (6.5%)
Octal Octal
21
29 (avg. 1.4)
21 (100.0%)
1 (4.8%)
Trinary Trinary
18
19 (avg. 1.1)
18 (100.0%)
0 (0.0%)
42 unimplemented practice exercises
Affine Cipher Affine Cipher
View dataThe link opens in a new window or tab
Baffling Birthdays Baffling Birthdays
View dataThe link opens in a new window or tab
Bottle Song Bottle Song
View dataThe link opens in a new window or tab
Conway's Game of Life Conway's Game of Life
View dataThe link opens in a new window or tab
D&D Character D&D Character
View dataThe link opens in a new window or tab
DOT DSL DOT DSL
View dataThe link opens in a new window or tab
Eliud's Eggs Eliud's Eggs
View dataThe link opens in a new window or tab
Error Handling Error Handling
View dataThe link opens in a new window or tab
Go Counting Go Counting
View dataThe link opens in a new window or tab
Grep Grep
View dataThe link opens in a new window or tab
Hangman Hangman
View dataThe link opens in a new window or tab
Intergalactic Transmission Intergalactic Transmission
View dataThe link opens in a new window or tab
ISBN Verifier ISBN Verifier
View dataThe link opens in a new window or tab
Killer Sudoku Helper Killer Sudoku Helper
View dataThe link opens in a new window or tab
Knapsack Knapsack
View dataThe link opens in a new window or tab
Ledger Ledger
View dataThe link opens in a new window or tab
List Ops List Ops
View dataThe link opens in a new window or tab
Markdown Markdown
View dataThe link opens in a new window or tab
Micro Blog Micro Blog
View dataThe link opens in a new window or tab
PaaS I/O PaaS I/O
View dataThe link opens in a new window or tab
Poker Poker
View dataThe link opens in a new window or tab
POV POV
View dataThe link opens in a new window or tab
Proverb Proverb
View dataThe link opens in a new window or tab
Rational Numbers Rational Numbers
View dataThe link opens in a new window or tab
React React
View dataThe link opens in a new window or tab
Rectangles Rectangles
View dataThe link opens in a new window or tab
Relative Distance Relative Distance
View dataThe link opens in a new window or tab
Resistor Color Resistor Color
View dataThe link opens in a new window or tab
Resistor Color Duo Resistor Color Duo
View dataThe link opens in a new window or tab
Resistor Color Trio Resistor Color Trio
View dataThe link opens in a new window or tab
REST API REST API
View dataThe link opens in a new window or tab
Satellite Satellite
View dataThe link opens in a new window or tab
Split-Second Stopwatch Split-Second Stopwatch
View dataThe link opens in a new window or tab
Square Root Square Root
View dataThe link opens in a new window or tab
State of Tic-Tac-Toe State of Tic-Tac-Toe
View dataThe link opens in a new window or tab
Swift Scheduling Swift Scheduling
View dataThe link opens in a new window or tab
Tournament Tournament
View dataThe link opens in a new window or tab
Transpose Transpose
View dataThe link opens in a new window or tab
Tree Building Tree Building
View dataThe link opens in a new window or tab
Twelve Days Twelve Days
View dataThe link opens in a new window or tab
Two Bucket Two Bucket
View dataThe link opens in a new window or tab
Word Search Word Search
View dataThe link opens in a new window or tab

Programming Tags

Learn More

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

0 tags

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: cf2581bf8ec6cff018219aefbc77b0d2334ceacb (Takes up to 10 mins to deploy)

Total Test Runner Runs
167,942
Test Run Pass Rate
29.9% (50210)
Test Run Fail Rate
19.2% (32289)
Test Run Error Rate
50.9% (85443)

Representer

Learn More

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

Learn More

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.