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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
232
Submissions
7,545
Mentoring Discussions
7

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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: 8599c16c630079b2d031cae60736231d0c22760e (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
205
228 (avg. 1.1)
164 (80.0%)
0 (0.0%)
High Scores High Scores
69
217 (avg. 3.1)
49 (71.0%)
0 (0.0%)
Leap Leap
106
387 (avg. 3.7)
90 (84.9%)
1 (0.9%)
Raindrops Raindrops
82
608 (avg. 7.4)
73 (89.0%)
1 (1.2%)
Resistor Color Resistor Color
74
224 (avg. 3.0)
68 (91.9%)
0 (0.0%)
Two-Fer Two-Fer
66
179 (avg. 2.7)
65 (98.5%)
0 (0.0%)
Collatz Conjecture Collatz Conjecture
58
349 (avg. 6.0)
54 (93.1%)
3 (5.2%)
Complex Numbers Complex Numbers
39
161 (avg. 4.1)
30 (76.9%)
0 (0.0%)
Darts Darts
49
210 (avg. 4.3)
42 (85.7%)
0 (0.0%)
Difference of Squares Difference of Squares
39
109 (avg. 2.8)
39 (100.0%)
0 (0.0%)
Grains Grains
38
270 (avg. 7.1)
34 (89.5%)
0 (0.0%)
Isogram Isogram
34
199 (avg. 5.9)
28 (82.4%)
0 (0.0%)
Kindergarten Garden Kindergarten Garden
18
137 (avg. 7.6)
14 (77.8%)
0 (0.0%)
Micro Blog Micro Blog
19
99 (avg. 5.2)
15 (78.9%)
0 (0.0%)
Nucleotide Count Nucleotide Count
16
75 (avg. 4.7)
15 (93.8%)
0 (0.0%)
Proverb Proverb
15
61 (avg. 4.1)
14 (93.3%)
0 (0.0%)
Resistor Color Duo Resistor Color Duo
24
110 (avg. 4.6)
22 (91.7%)
0 (0.0%)
RNA Transcription RNA Transcription
26
73 (avg. 2.8)
24 (92.3%)
0 (0.0%)
Robot Simulator Robot Simulator
17
55 (avg. 3.2)
13 (76.5%)
0 (0.0%)
Roman Numerals Roman Numerals
12
11 (avg. 0.9)
10 (83.3%)
0 (0.0%)
Scrabble Score Scrabble Score
19
36 (avg. 1.9)
18 (94.7%)
0 (0.0%)
Secret Handshake Secret Handshake
17
57 (avg. 3.4)
16 (94.1%)
0 (0.0%)
Series Series
15
76 (avg. 5.1)
13 (86.7%)
0 (0.0%)
Space Age Space Age
20
50 (avg. 2.5)
20 (100.0%)
0 (0.0%)
Sublist Sublist
19
61 (avg. 3.2)
14 (73.7%)
1 (5.3%)
Sum of Multiples Sum of Multiples
12
21 (avg. 1.8)
10 (83.3%)
0 (0.0%)
Triangle Triangle
13
36 (avg. 2.8)
10 (76.9%)
1 (7.7%)
Allergies Allergies
10
17 (avg. 1.7)
7 (70.0%)
0 (0.0%)
Armstrong Numbers Armstrong Numbers
14
60 (avg. 4.3)
14 (100.0%)
0 (0.0%)
Atbash Cipher Atbash Cipher
6
30 (avg. 5.0)
5 (83.3%)
0 (0.0%)
Binary Search Binary Search
16
56 (avg. 3.5)
12 (75.0%)
1 (6.3%)
Bob Bob
11
27 (avg. 2.5)
10 (90.9%)
0 (0.0%)
Clock Clock
25
291 (avg. 11.6)
17 (68.0%)
0 (0.0%)
Crypto Square Crypto Square
7
61 (avg. 8.7)
6 (85.7%)
0 (0.0%)
Diamond Diamond
12
46 (avg. 3.8)
9 (75.0%)
0 (0.0%)
ETL ETL
16
26 (avg. 1.6)
14 (87.5%)
0 (0.0%)
Hamming Hamming
14
50 (avg. 3.6)
12 (85.7%)
0 (0.0%)
ISBN Verifier ISBN Verifier
11
44 (avg. 4.0)
9 (81.8%)
0 (0.0%)
Largest Series Product Largest Series Product
6
48 (avg. 8.0)
4 (66.7%)
0 (0.0%)
Matching Brackets Matching Brackets
10
27 (avg. 2.7)
8 (80.0%)
0 (0.0%)
Matrix Matrix
11
111 (avg. 10.1)
9 (81.8%)
0 (0.0%)
Nth Prime Nth Prime
8
9 (avg. 1.1)
7 (87.5%)
0 (0.0%)
Pangram Pangram
15
23 (avg. 1.5)
13 (86.7%)
0 (0.0%)
Pascal's Triangle Pascal's Triangle
6
9 (avg. 1.5)
5 (83.3%)
0 (0.0%)
Phone Number Phone Number
6
68 (avg. 11.3)
5 (83.3%)
0 (0.0%)
Protein Translation Protein Translation
9
60 (avg. 6.7)
8 (88.9%)
0 (0.0%)
Pythagorean Triplet Pythagorean Triplet
7
139 (avg. 19.9)
5 (71.4%)
0 (0.0%)
Queen Attack Queen Attack
9
31 (avg. 3.4)
8 (88.9%)
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
8
68 (avg. 8.5)
5 (62.5%)
0 (0.0%)
Word Count Word Count
7
66 (avg. 9.4)
6 (85.7%)
0 (0.0%)
Yacht Yacht
7
34 (avg. 4.9)
6 (85.7%)
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
9
15 (avg. 1.7)
8 (88.9%)
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
6
6 (avg. 1.0)
5 (83.3%)
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
8
8 (avg. 1.0)
6 (75.0%)
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
10
18 (avg. 1.8)
9 (90.0%)
1 (10.0%)
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
8
13 (avg. 1.6)
7 (87.5%)
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
5
27 (avg. 5.4)
4 (80.0%)
0 (0.0%)
Tournament Tournament
4
10 (avg. 2.5)
3 (75.0%)
0 (0.0%)
Two Bucket Two Bucket
3
3 (avg. 1.0)
2 (66.7%)
0 (0.0%)
Word Search Word Search
4
8 (avg. 2.0)
3 (75.0%)
0 (0.0%)
Bowling Bowling
5
31 (avg. 6.2)
2 (40.0%)
0 (0.0%)
Pig Latin Pig Latin
6
51 (avg. 8.5)
4 (66.7%)
0 (0.0%)
Poker Poker
4
62 (avg. 15.5)
2 (50.0%)
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
6
12 (avg. 2.0)
3 (50.0%)
0 (0.0%)
REST API REST API
12
52 (avg. 4.3)
3 (25.0%)
0 (0.0%)
Forth Forth
9
42 (avg. 4.7)
7 (77.8%)
0 (0.0%)
SGF Parsing SGF Parsing
4
35 (avg. 8.8)
1 (25.0%)
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: 665650b59c05ac388ce510fe15dc20689e98684b (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
7,512
Test Run Pass Rate
30.1% (2262)
Test Run Fail Rate
16.2% (1216)
Test Run Error Rate
53.7% (4034)

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.