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R Track Management

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

Students
14,682
Submissions
111,483
Mentoring Discussions
1,597

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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: b6c2f81860fd66170fb0d2ea7ed7fcaa09b10961 (Updates should be instant)

Next goal: Implement 131 practice exercises. Find out more.
76 active practice exercises
Started
Attempts
Completions
Mentoring requests
Hello World Hello World
9,046
17,982 (avg. 2.0)
6,195 (68.5%)
1 (0.0%)
Two Fer Two Fer
4,212
23,149 (avg. 5.5)
2,005 (47.6%)
414 (9.8%)
Leap Leap
2,250
8,580 (avg. 3.8)
1,611 (71.6%)
304 (13.5%)
Darts Darts
644
2,364 (avg. 3.7)
467 (72.5%)
19 (3.0%)
Raindrops Raindrops
1,708
9,603 (avg. 5.6)
1,367 (80.0%)
174 (10.2%)
Hamming Hamming
1,109
6,069 (avg. 5.5)
849 (76.6%)
156 (14.1%)
Phone Number Phone Number
736
6,637 (avg. 9.0)
485 (65.9%)
69 (9.4%)
Anagram Anagram
541
3,875 (avg. 7.2)
365 (67.5%)
67 (12.4%)
Word Count Word Count
506
2,854 (avg. 5.6)
285 (56.3%)
41 (8.1%)
Rotational Cipher Rotational Cipher
297
1,622 (avg. 5.5)
213 (71.7%)
27 (9.1%)
Tournament Tournament
314
2,285 (avg. 7.3)
149 (47.5%)
22 (7.0%)
Difference of Squares Difference of Squares
619
1,382 (avg. 2.2)
526 (85.0%)
46 (7.4%)
Grains Grains
431
1,190 (avg. 2.8)
348 (80.7%)
38 (8.8%)
Space Age Space Age
356
1,723 (avg. 4.8)
279 (78.4%)
23 (6.5%)
Collatz Conjecture Collatz Conjecture
289
1,515 (avg. 5.2)
218 (75.4%)
13 (4.5%)
Perfect Numbers Perfect Numbers
276
1,199 (avg. 4.3)
207 (75.0%)
27 (9.8%)
Sieve Sieve
214
813 (avg. 3.8)
153 (71.5%)
9 (4.2%)
Acronym Acronym
234
1,113 (avg. 4.8)
160 (68.4%)
12 (5.1%)
Fizz Buzz Fizz Buzz
254
1,023 (avg. 4.0)
203 (79.9%)
9 (3.5%)
Secret Handshake Secret Handshake
187
550 (avg. 2.9)
130 (69.5%)
11 (5.9%)
RNA Transcription RNA Transcription
310
813 (avg. 2.6)
235 (75.8%)
22 (7.1%)
ETL ETL
113
567 (avg. 5.0)
71 (62.8%)
2 (1.8%)
Allergies Allergies
182
497 (avg. 2.7)
116 (63.7%)
3 (1.6%)
Luhn Luhn
168
806 (avg. 4.8)
115 (68.5%)
5 (3.0%)
Bob Bob
251
1,153 (avg. 4.6)
179 (71.3%)
37 (14.7%)
Isogram Isogram
184
516 (avg. 2.8)
137 (74.5%)
4 (2.2%)
Pangram Pangram
159
456 (avg. 2.9)
123 (77.4%)
5 (3.1%)
Sum of Multiples Sum of Multiples
226
598 (avg. 2.6)
169 (74.8%)
26 (11.5%)
Beer Song Beer Song
143
635 (avg. 4.4)
95 (66.4%)
1 (0.7%)
Prime Factors Prime Factors
154
445 (avg. 2.9)
112 (72.7%)
3 (1.9%)
Triangle Triangle
170
747 (avg. 4.4)
88 (51.8%)
3 (1.8%)
Nucleotide Count Nucleotide Count
162
692 (avg. 4.3)
112 (69.1%)
4 (2.5%)
Scrabble Score Scrabble Score
150
376 (avg. 2.5)
112 (74.7%)
4 (2.7%)
Diamond Diamond
117
620 (avg. 5.3)
71 (60.7%)
2 (1.7%)
Largest Series Product Largest Series Product
163
686 (avg. 4.2)
117 (71.8%)
7 (4.3%)
Pascal's Triangle Pascal's Triangle
161
678 (avg. 4.2)
97 (60.2%)
7 (4.3%)
Crypto Square Crypto Square
164
1,785 (avg. 10.9)
92 (56.1%)
5 (3.0%)
Saddle Points Saddle Points
79
334 (avg. 4.2)
58 (73.4%)
2 (2.5%)
Armstrong Numbers Armstrong Numbers
73
237 (avg. 3.2)
63 (86.3%)
2 (2.7%)
Queen Attack Queen Attack
60
253 (avg. 4.2)
41 (68.3%)
0 (0.0%)
Pythagorean Triplet Pythagorean Triplet
39
204 (avg. 5.2)
28 (71.8%)
1 (2.6%)
Reverse String Reverse String
70
219 (avg. 3.1)
57 (81.4%)
2 (2.9%)
Roman Numerals Roman Numerals
44
139 (avg. 3.2)
35 (79.5%)
1 (2.3%)
Protein Translation Protein Translation
41
393 (avg. 9.6)
28 (68.3%)
0 (0.0%)
Eliud's Eggs Eliud's Eggs
33
64 (avg. 1.9)
30 (90.9%)
0 (0.0%)
All Your Base All Your Base
54
527 (avg. 9.8)
38 (70.4%)
0 (0.0%)
Robot Simulator Robot Simulator
34
95 (avg. 2.8)
19 (55.9%)
0 (0.0%)
Series Series
14
54 (avg. 3.9)
13 (92.9%)
0 (0.0%)
Conway's Game of Life Conway's Game of Life
7
44 (avg. 6.3)
6 (85.7%)
0 (0.0%)
Gigasecond Gigasecond
10
19 (avg. 1.9)
9 (90.0%)
0 (0.0%)
Square Root Square Root
12
20 (avg. 1.7)
9 (75.0%)
0 (0.0%)
Knapsack Knapsack
6
40 (avg. 6.7)
4 (66.7%)
0 (0.0%)
High Scores High Scores
10
32 (avg. 3.2)
8 (80.0%)
0 (0.0%)
ISBN Verifier ISBN Verifier
9
74 (avg. 8.2)
7 (77.8%)
0 (0.0%)
Kindergarten Garden Kindergarten Garden
8
56 (avg. 7.0)
6 (75.0%)
0 (0.0%)
Atbash Cipher Atbash Cipher
7
56 (avg. 8.0)
5 (71.4%)
0 (0.0%)
Rail Fence Cipher Rail Fence Cipher
5
51 (avg. 10.2)
2 (40.0%)
0 (0.0%)
Flatten Array Flatten Array
8
29 (avg. 3.6)
8 (100.0%)
0 (0.0%)
Matching Brackets Matching Brackets
7
70 (avg. 10.0)
6 (85.7%)
0 (0.0%)
Matrix Matrix
7
73 (avg. 10.4)
5 (71.4%)
0 (0.0%)
Resistor Color Resistor Color
6
20 (avg. 3.3)
5 (83.3%)
0 (0.0%)
Resistor Color Duo Resistor Color Duo
5
27 (avg. 5.4)
5 (100.0%)
0 (0.0%)
Simple Cipher Simple Cipher
5
110 (avg. 22.0)
4 (80.0%)
0 (0.0%)
Strain Strain
5
57 (avg. 11.4)
3 (60.0%)
0 (0.0%)
Proverb Proverb
3
12 (avg. 4.0)
2 (66.7%)
0 (0.0%)
Zebra Puzzle Zebra Puzzle
9
30 (avg. 3.3)
3 (33.3%)
0 (0.0%)
Twelve Days Twelve Days
5
19 (avg. 3.8)
3 (60.0%)
0 (0.0%)
House House
3
18 (avg. 6.0)
2 (66.7%)
0 (0.0%)
Run-Length Encoding Run-Length Encoding
7
52 (avg. 7.4)
2 (28.6%)
0 (0.0%)
List Ops List Ops
3
57 (avg. 19.0)
1 (33.3%)
0 (0.0%)
D&D Character D&D Character
3
65 (avg. 21.7)
3 (100.0%)
0 (0.0%)
Binary Search Binary Search
4
11 (avg. 2.8)
2 (50.0%)
0 (0.0%)
Robot Name Robot Name
4
21 (avg. 5.3)
1 (25.0%)
0 (0.0%)
Food Chain Food Chain
5
192 (avg. 38.4)
2 (40.0%)
0 (0.0%)
Clock Clock
4
73 (avg. 18.3)
3 (75.0%)
0 (0.0%)
Nth Prime Nth Prime
7
7 (avg. 1.0)
2 (28.6%)
0 (0.0%)
55 unimplemented practice exercises
Affine Cipher Affine Cipher
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Alphametics Alphametics
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Bank Account Bank Account
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Binary Search Tree Binary Search Tree
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Book Store Book Store
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Bottle Song Bottle Song
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Bowling Bowling
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Change Change
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Circular Buffer Circular Buffer
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Complex Numbers Complex Numbers
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Connect Connect
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Custom Set Custom Set
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Dominoes Dominoes
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DOT DSL DOT DSL
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Error Handling Error Handling
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Forth Forth
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Go Counting Go Counting
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Grade School Grade School
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Grep Grep
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Hangman Hangman
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Killer Sudoku Helper Killer Sudoku Helper
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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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Meetup Meetup
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Micro Blog Micro Blog
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Minesweeper Minesweeper
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OCR Numbers OCR Numbers
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PaaS I/O PaaS I/O
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Palindrome Products Palindrome Products
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Parallel Letter Frequency Parallel Letter Frequency
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Pig Latin Pig Latin
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Poker Poker
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POV POV
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Rational Numbers Rational Numbers
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React React
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Rectangles Rectangles
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Resistor Color Trio Resistor Color Trio
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REST API REST API
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Satellite Satellite
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Say Say
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SGF Parsing SGF Parsing
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Simple Linked List Simple Linked List
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Spiral Matrix Spiral Matrix
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State of Tic-Tac-Toe State of Tic-Tac-Toe
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Sublist Sublist
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Transpose Transpose
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Tree Building Tree Building
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Two Bucket Two Bucket
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Variable Length Quantity Variable Length Quantity
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Word Search Word Search
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Wordy Wordy
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Yacht Yacht
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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: 9d0baa70733051955c3e5841f9227240b711270b (Takes up to 10 mins to deploy)

Next goal: Get Test Runners to Version 2. R is currently utilising a Version 1 Test Runner. Find out more.
Total Test Runner Runs
108,734
Test Run Pass Rate
21.8% (23723)
Test Run Fail Rate
77.1% (83848)
Test Run Error Rate
1.1% (1163)

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

Next goal: Build an Analyzer. Find out more.