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Roc
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Roc Track Management

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

Students
264
Submissions
8,332
Mentoring Discussions
8

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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.

Synced primary repo: be5f060c1fa8f52f97d9a69497de1ede2ab2f53e (Updates should be instant)

Next goal: Implement 129 practice exercises. Find out more.
105 active practice exercises
Started
Attempts
Completions
Mentoring requests
Hello World Hello World
234
277 (avg. 1.2)
186 (79.5%)
0 (0.0%)
High Scores High Scores
86
326 (avg. 3.8)
61 (70.9%)
0 (0.0%)
Leap Leap
118
414 (avg. 3.5)
101 (85.6%)
1 (0.8%)
Raindrops Raindrops
93
716 (avg. 7.7)
84 (90.3%)
1 (1.1%)
Resistor Color Resistor Color
82
241 (avg. 2.9)
76 (92.7%)
0 (0.0%)
Two-Fer Two-Fer
74
212 (avg. 2.9)
73 (98.6%)
0 (0.0%)
Collatz Conjecture Collatz Conjecture
66
457 (avg. 6.9)
57 (86.4%)
3 (4.5%)
Complex Numbers Complex Numbers
44
177 (avg. 4.0)
35 (79.5%)
0 (0.0%)
Darts Darts
56
225 (avg. 4.0)
49 (87.5%)
0 (0.0%)
Difference of Squares Difference of Squares
48
125 (avg. 2.6)
48 (100.0%)
0 (0.0%)
Grains Grains
47
305 (avg. 6.5)
40 (85.1%)
0 (0.0%)
Isogram Isogram
43
259 (avg. 6.0)
33 (76.7%)
1 (2.3%)
Kindergarten Garden Kindergarten Garden
23
206 (avg. 9.0)
16 (69.6%)
0 (0.0%)
Micro Blog Micro Blog
22
104 (avg. 4.7)
17 (77.3%)
0 (0.0%)
Nucleotide Count Nucleotide Count
20
84 (avg. 4.2)
19 (95.0%)
0 (0.0%)
Proverb Proverb
17
69 (avg. 4.1)
16 (94.1%)
0 (0.0%)
Resistor Color Duo Resistor Color Duo
27
113 (avg. 4.2)
23 (85.2%)
0 (0.0%)
RNA Transcription RNA Transcription
29
88 (avg. 3.0)
26 (89.7%)
0 (0.0%)
Robot Simulator Robot Simulator
18
57 (avg. 3.2)
14 (77.8%)
0 (0.0%)
Roman Numerals Roman Numerals
13
13 (avg. 1.0)
11 (84.6%)
0 (0.0%)
Scrabble Score Scrabble Score
21
38 (avg. 1.8)
18 (85.7%)
0 (0.0%)
Secret Handshake Secret Handshake
17
58 (avg. 3.4)
16 (94.1%)
0 (0.0%)
Series Series
16
77 (avg. 4.8)
13 (81.3%)
0 (0.0%)
Space Age Space Age
20
51 (avg. 2.6)
20 (100.0%)
0 (0.0%)
Sublist Sublist
20
62 (avg. 3.1)
14 (70.0%)
1 (5.0%)
Sum of Multiples Sum of Multiples
14
26 (avg. 1.9)
11 (78.6%)
0 (0.0%)
Triangle Triangle
14
38 (avg. 2.7)
11 (78.6%)
1 (7.1%)
Allergies Allergies
11
18 (avg. 1.6)
7 (63.6%)
0 (0.0%)
Armstrong Numbers Armstrong Numbers
14
61 (avg. 4.4)
14 (100.0%)
0 (0.0%)
Atbash Cipher Atbash Cipher
6
31 (avg. 5.2)
5 (83.3%)
0 (0.0%)
Binary Search Binary Search
16
59 (avg. 3.7)
12 (75.0%)
1 (6.3%)
Bob Bob
12
35 (avg. 2.9)
10 (83.3%)
0 (0.0%)
Clock Clock
25
294 (avg. 11.8)
17 (68.0%)
0 (0.0%)
Crypto Square Crypto Square
7
62 (avg. 8.9)
6 (85.7%)
0 (0.0%)
Diamond Diamond
12
47 (avg. 3.9)
9 (75.0%)
0 (0.0%)
ETL ETL
16
28 (avg. 1.8)
14 (87.5%)
0 (0.0%)
Hamming Hamming
14
51 (avg. 3.6)
12 (85.7%)
0 (0.0%)
ISBN Verifier ISBN Verifier
11
45 (avg. 4.1)
9 (81.8%)
0 (0.0%)
Largest Series Product Largest Series Product
6
49 (avg. 8.2)
4 (66.7%)
0 (0.0%)
Matching Brackets Matching Brackets
10
28 (avg. 2.8)
8 (80.0%)
0 (0.0%)
Matrix Matrix
11
114 (avg. 10.4)
9 (81.8%)
0 (0.0%)
Nth Prime Nth Prime
8
10 (avg. 1.3)
7 (87.5%)
0 (0.0%)
Pangram Pangram
15
24 (avg. 1.6)
13 (86.7%)
0 (0.0%)
Pascal's Triangle Pascal's Triangle
6
10 (avg. 1.7)
5 (83.3%)
0 (0.0%)
Phone Number Phone Number
6
69 (avg. 11.5)
5 (83.3%)
0 (0.0%)
Protein Translation Protein Translation
9
61 (avg. 6.8)
8 (88.9%)
0 (0.0%)
Pythagorean Triplet Pythagorean Triplet
7
140 (avg. 20.0)
5 (71.4%)
0 (0.0%)
Queen Attack Queen Attack
10
34 (avg. 3.4)
8 (80.0%)
0 (0.0%)
Rectangles Rectangles
11
32 (avg. 2.9)
5 (45.5%)
0 (0.0%)
Reverse String Reverse String
10
19 (avg. 1.9)
9 (90.0%)
0 (0.0%)
Rotational Cipher Rotational Cipher
9
10 (avg. 1.1)
8 (88.9%)
0 (0.0%)
Saddle Points Saddle Points
6
6 (avg. 1.0)
4 (66.7%)
0 (0.0%)
Say Say
8
74 (avg. 9.3)
6 (75.0%)
0 (0.0%)
Sieve Sieve
6
16 (avg. 2.7)
5 (83.3%)
0 (0.0%)
Simple Linked List Simple Linked List
4
14 (avg. 3.5)
3 (75.0%)
0 (0.0%)
Spiral Matrix Spiral Matrix
4
21 (avg. 5.3)
3 (75.0%)
0 (0.0%)
Square Root Square Root
6
5 (avg. 0.8)
5 (83.3%)
0 (0.0%)
Strain Strain
6
7 (avg. 1.2)
5 (83.3%)
0 (0.0%)
Transpose Transpose
9
68 (avg. 7.6)
5 (55.6%)
0 (0.0%)
Word Count Word Count
8
69 (avg. 8.6)
7 (87.5%)
0 (0.0%)
Yacht Yacht
8
35 (avg. 4.4)
7 (87.5%)
0 (0.0%)
Affine Cipher Affine Cipher
5
35 (avg. 7.0)
3 (60.0%)
0 (0.0%)
Anagram Anagram
17
126 (avg. 7.4)
10 (58.8%)
0 (0.0%)
Binary Search Tree Binary Search Tree
9
48 (avg. 5.3)
7 (77.8%)
0 (0.0%)
Custom Set Custom Set
6
5 (avg. 0.8)
3 (50.0%)
0 (0.0%)
Eliud's Eggs Eliud's Eggs
11
20 (avg. 1.8)
10 (90.9%)
0 (0.0%)
Food Chain Food Chain
6
51 (avg. 8.5)
3 (50.0%)
0 (0.0%)
House House
7
28 (avg. 4.0)
6 (85.7%)
0 (0.0%)
Meetup Meetup
2
12 (avg. 6.0)
1 (50.0%)
0 (0.0%)
OCR Numbers OCR Numbers
4
215 (avg. 53.8)
2 (50.0%)
0 (0.0%)
Perfect Numbers Perfect Numbers
5
4 (avg. 0.8)
4 (80.0%)
0 (0.0%)
Prime Factors Prime Factors
7
11 (avg. 1.6)
6 (85.7%)
0 (0.0%)
Run-Length Encoding Run-Length Encoding
5
16 (avg. 3.2)
4 (80.0%)
0 (0.0%)
Variable Length Quantity Variable Length Quantity
3
13 (avg. 4.3)
2 (66.7%)
0 (0.0%)
All Your Base All Your Base
9
10 (avg. 1.1)
7 (77.8%)
0 (0.0%)
Circular Buffer Circular Buffer
7
55 (avg. 7.9)
6 (85.7%)
0 (0.0%)
Error Handling Error Handling
9
63 (avg. 7.0)
7 (77.8%)
0 (0.0%)
Flatten Array Flatten Array
11
19 (avg. 1.7)
9 (81.8%)
1 (9.1%)
Killer Sudoku Helper Killer Sudoku Helper
6
18 (avg. 3.0)
2 (33.3%)
0 (0.0%)
Knapsack Knapsack
4
6 (avg. 1.5)
3 (75.0%)
0 (0.0%)
Rail Fence Cipher Rail Fence Cipher
4
9 (avg. 2.3)
2 (50.0%)
0 (0.0%)
Acronym Acronym
10
20 (avg. 2.0)
8 (80.0%)
0 (0.0%)
Change Change
3
12 (avg. 4.0)
2 (66.7%)
0 (0.0%)
Connect Connect
6
67 (avg. 11.2)
3 (50.0%)
0 (0.0%)
Go Counting Go Counting
5
261 (avg. 52.2)
3 (60.0%)
0 (0.0%)
Gigasecond Gigasecond
5
32 (avg. 6.4)
4 (80.0%)
1 (20.0%)
List Ops List Ops
11
12 (avg. 1.1)
9 (81.8%)
0 (0.0%)
Luhn Luhn
9
21 (avg. 2.3)
8 (88.9%)
1 (11.1%)
Minesweeper Minesweeper
7
13 (avg. 1.9)
5 (71.4%)
0 (0.0%)
Palindrome Products Palindrome Products
2
28 (avg. 14.0)
0 (0.0%)
0 (0.0%)
Rational Numbers Rational Numbers
6
28 (avg. 4.7)
5 (83.3%)
0 (0.0%)
Tournament Tournament
5
13 (avg. 2.6)
4 (80.0%)
0 (0.0%)
Two Bucket Two Bucket
3
3 (avg. 1.0)
2 (66.7%)
0 (0.0%)
Word Search Word Search
5
8 (avg. 1.6)
3 (60.0%)
0 (0.0%)
Bowling Bowling
5
31 (avg. 6.2)
2 (40.0%)
0 (0.0%)
Pig Latin Pig Latin
7
52 (avg. 7.4)
5 (71.4%)
0 (0.0%)
Poker Poker
5
63 (avg. 12.6)
3 (60.0%)
0 (0.0%)
Wordy Wordy
5
27 (avg. 5.4)
4 (80.0%)
0 (0.0%)
Zebra Puzzle Zebra Puzzle
2
15 (avg. 7.5)
1 (50.0%)
0 (0.0%)
Alphametics Alphametics
6
63 (avg. 10.5)
2 (33.3%)
0 (0.0%)
Dominoes Dominoes
5
42 (avg. 8.4)
3 (60.0%)
0 (0.0%)
Grep Grep
7
13 (avg. 1.9)
4 (57.1%)
0 (0.0%)
REST API REST API
13
52 (avg. 4.0)
3 (23.1%)
0 (0.0%)
Forth Forth
9
42 (avg. 4.7)
7 (77.8%)
0 (0.0%)
SGF Parsing SGF Parsing
5
35 (avg. 7.0)
1 (20.0%)
0 (0.0%)
4 deprecated practice exercises
Started
Attempts
Completions
Mentoring requests
Accumulate Accumulate
21
46 (avg. 2.2)
21 (100.0%)
0 (0.0%)
Binary Binary
16
82 (avg. 5.1)
14 (87.5%)
0 (0.0%)
Hexadecimal Hexadecimal
5
13 (avg. 2.6)
3 (60.0%)
0 (0.0%)
Octal Octal
4
10 (avg. 2.5)
4 (100.0%)
0 (0.0%)
24 unimplemented practice exercises
Bank Account Bank Account
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Book Store Book Store
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Bottle Song Bottle Song
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Conway's Game of Life Conway's Game of Life
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D&D Character D&D Character
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DOT DSL DOT DSL
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Grade School Grade School
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Hangman Hangman
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Ledger Ledger
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Lens Person Lens Person
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Linked List Linked List
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Markdown Markdown
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PaaS I/O PaaS I/O
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Parallel Letter Frequency Parallel Letter Frequency
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POV POV
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React React
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Resistor Color Trio Resistor Color Trio
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Robot Name Robot Name
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Satellite Satellite
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Simple Cipher Simple Cipher
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State of Tic-Tac-Toe State of Tic-Tac-Toe
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Tree Building Tree Building
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Twelve Days Twelve Days
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Zipper Zipper
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Programming Tags

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

0 tags

Test Runner

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

Current version: 1526cf3bff36905ab6f33e7f3f096bdb098e4f13 (Takes up to 10 mins to deploy)

Next goal: Get Test Runners to Version 2. Roc is currently utilising a Version 1 Test Runner. Find out more.
Total Test Runner Runs
8,296
Test Run Pass Rate
29.7% (2463)
Test Run Fail Rate
15.7% (1302)
Test Run Error Rate
54.6% (4531)

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 Roc: Exercism's analyzers automatically assess student's submissions and provide mentor-style commentary.

Next goal: Build an Analyzer. Find out more.