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

Students
14,877
Submissions
114,539
Mentoring Discussions
1,606

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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: 328c5e6560a90c1cabf4cb59cc56d3db8b29a59d (Updates should be instant)

Next goal: Implement 131 practice exercises. Find out more.
81 active practice exercises
Started
Attempts
Completions
Mentoring requests
Hello World Hello World
9,209
18,331 (avg. 2.0)
6,276 (68.2%)
1 (0.0%)
Two Fer Two Fer
4,281
23,624 (avg. 5.5)
2,037 (47.6%)
419 (9.8%)
Leap Leap
2,280
8,694 (avg. 3.8)
1,629 (71.4%)
306 (13.4%)
Darts Darts
669
2,403 (avg. 3.6)
486 (72.6%)
19 (2.8%)
Raindrops Raindrops
1,725
9,690 (avg. 5.6)
1,382 (80.1%)
175 (10.1%)
Hamming Hamming
1,123
6,162 (avg. 5.5)
862 (76.8%)
156 (13.9%)
Phone Number Phone Number
750
6,815 (avg. 9.1)
495 (66.0%)
69 (9.2%)
Anagram Anagram
549
3,944 (avg. 7.2)
370 (67.4%)
67 (12.2%)
Word Count Word Count
513
2,914 (avg. 5.7)
289 (56.3%)
41 (8.0%)
Rotational Cipher Rotational Cipher
301
1,682 (avg. 5.6)
216 (71.8%)
27 (9.0%)
Tournament Tournament
317
2,368 (avg. 7.5)
152 (47.9%)
22 (6.9%)
Difference of Squares Difference of Squares
628
1,399 (avg. 2.2)
534 (85.0%)
46 (7.3%)
Grains Grains
437
1,203 (avg. 2.8)
352 (80.5%)
38 (8.7%)
Space Age Space Age
361
1,741 (avg. 4.8)
282 (78.1%)
23 (6.4%)
Collatz Conjecture Collatz Conjecture
293
1,545 (avg. 5.3)
223 (76.1%)
13 (4.4%)
Perfect Numbers Perfect Numbers
280
1,223 (avg. 4.4)
211 (75.4%)
27 (9.6%)
Sieve Sieve
216
826 (avg. 3.8)
155 (71.8%)
9 (4.2%)
Acronym Acronym
236
1,141 (avg. 4.8)
162 (68.6%)
12 (5.1%)
Fizz Buzz Fizz Buzz
256
1,031 (avg. 4.0)
205 (80.1%)
9 (3.5%)
Secret Handshake Secret Handshake
189
554 (avg. 2.9)
132 (69.8%)
11 (5.8%)
RNA Transcription RNA Transcription
312
821 (avg. 2.6)
237 (76.0%)
22 (7.1%)
ETL ETL
116
601 (avg. 5.2)
73 (62.9%)
2 (1.7%)
Allergies Allergies
184
526 (avg. 2.9)
118 (64.1%)
3 (1.6%)
Luhn Luhn
170
829 (avg. 4.9)
117 (68.8%)
5 (2.9%)
Bob Bob
253
1,186 (avg. 4.7)
181 (71.5%)
37 (14.6%)
Isogram Isogram
187
531 (avg. 2.8)
139 (74.3%)
4 (2.1%)
Pangram Pangram
161
464 (avg. 2.9)
125 (77.6%)
5 (3.1%)
Sum of Multiples Sum of Multiples
229
609 (avg. 2.7)
171 (74.7%)
26 (11.4%)
Beer Song Beer Song
145
685 (avg. 4.7)
98 (67.6%)
1 (0.7%)
Prime Factors Prime Factors
158
459 (avg. 2.9)
116 (73.4%)
3 (1.9%)
Triangle Triangle
175
798 (avg. 4.6)
92 (52.6%)
3 (1.7%)
Nucleotide Count Nucleotide Count
166
712 (avg. 4.3)
116 (69.9%)
4 (2.4%)
Scrabble Score Scrabble Score
155
389 (avg. 2.5)
117 (75.5%)
4 (2.6%)
Diamond Diamond
120
635 (avg. 5.3)
75 (62.5%)
2 (1.7%)
Largest Series Product Largest Series Product
168
702 (avg. 4.2)
121 (72.0%)
8 (4.8%)
Pascal's Triangle Pascal's Triangle
164
690 (avg. 4.2)
100 (61.0%)
7 (4.3%)
Crypto Square Crypto Square
167
1,871 (avg. 11.2)
95 (56.9%)
5 (3.0%)
Saddle Points Saddle Points
82
353 (avg. 4.3)
61 (74.4%)
2 (2.4%)
Armstrong Numbers Armstrong Numbers
76
243 (avg. 3.2)
66 (86.8%)
2 (2.6%)
Queen Attack Queen Attack
64
288 (avg. 4.5)
45 (70.3%)
0 (0.0%)
Pythagorean Triplet Pythagorean Triplet
43
235 (avg. 5.5)
33 (76.7%)
1 (2.3%)
Reverse String Reverse String
74
231 (avg. 3.1)
61 (82.4%)
2 (2.7%)
Roman Numerals Roman Numerals
49
154 (avg. 3.1)
40 (81.6%)
1 (2.0%)
Protein Translation Protein Translation
45
424 (avg. 9.4)
32 (71.1%)
0 (0.0%)
Eliud's Eggs Eliud's Eggs
38
68 (avg. 1.8)
34 (89.5%)
0 (0.0%)
All Your Base All Your Base
56
545 (avg. 9.7)
40 (71.4%)
0 (0.0%)
Robot Simulator Robot Simulator
37
110 (avg. 3.0)
21 (56.8%)
0 (0.0%)
Series Series
17
59 (avg. 3.5)
16 (94.1%)
0 (0.0%)
Conway's Game of Life Conway's Game of Life
10
72 (avg. 7.2)
9 (90.0%)
0 (0.0%)
Gigasecond Gigasecond
13
22 (avg. 1.7)
12 (92.3%)
0 (0.0%)
Square Root Square Root
15
23 (avg. 1.5)
12 (80.0%)
0 (0.0%)
Knapsack Knapsack
9
60 (avg. 6.7)
7 (77.8%)
0 (0.0%)
High Scores High Scores
14
53 (avg. 3.8)
12 (85.7%)
0 (0.0%)
ISBN Verifier ISBN Verifier
13
106 (avg. 8.2)
10 (76.9%)
0 (0.0%)
Kindergarten Garden Kindergarten Garden
12
61 (avg. 5.1)
9 (75.0%)
0 (0.0%)
Atbash Cipher Atbash Cipher
10
60 (avg. 6.0)
8 (80.0%)
0 (0.0%)
Rail Fence Cipher Rail Fence Cipher
7
185 (avg. 26.4)
4 (57.1%)
0 (0.0%)
Flatten Array Flatten Array
10
31 (avg. 3.1)
10 (100.0%)
0 (0.0%)
Matching Brackets Matching Brackets
10
76 (avg. 7.6)
10 (100.0%)
0 (0.0%)
Matrix Matrix
9
90 (avg. 10.0)
8 (88.9%)
0 (0.0%)
Resistor Color Resistor Color
9
23 (avg. 2.6)
8 (88.9%)
0 (0.0%)
Resistor Color Duo Resistor Color Duo
9
31 (avg. 3.4)
9 (100.0%)
0 (0.0%)
Simple Cipher Simple Cipher
8
126 (avg. 15.8)
6 (75.0%)
0 (0.0%)
Strain Strain
7
74 (avg. 10.6)
6 (85.7%)
0 (0.0%)
Proverb Proverb
6
19 (avg. 3.2)
4 (66.7%)
0 (0.0%)
Zebra Puzzle Zebra Puzzle
11
40 (avg. 3.6)
5 (45.5%)
0 (0.0%)
Twelve Days Twelve Days
8
47 (avg. 5.9)
6 (75.0%)
0 (0.0%)
House House
7
51 (avg. 7.3)
5 (71.4%)
0 (0.0%)
Run-Length Encoding Run-Length Encoding
10
76 (avg. 7.6)
4 (40.0%)
0 (0.0%)
List Ops List Ops
5
59 (avg. 11.8)
3 (60.0%)
0 (0.0%)
D&D Character D&D Character
6
112 (avg. 18.7)
6 (100.0%)
0 (0.0%)
Binary Search Binary Search
7
19 (avg. 2.7)
5 (71.4%)
0 (0.0%)
Robot Name Robot Name
7
24 (avg. 3.4)
4 (57.1%)
0 (0.0%)
Food Chain Food Chain
9
217 (avg. 24.1)
5 (55.6%)
0 (0.0%)
Clock Clock
6
91 (avg. 15.2)
5 (83.3%)
0 (0.0%)
Nth Prime Nth Prime
8
104 (avg. 13.0)
4 (50.0%)
0 (0.0%)
Killer Sudoku Helper Killer Sudoku Helper
3
8 (avg. 2.7)
2 (66.7%)
0 (0.0%)
Change Change
2
1 (avg. 0.5)
1 (50.0%)
0 (0.0%)
Pig Latin Pig Latin
1
0 (avg. 0.0)
0 (0.0%)
0 (0.0%)
Sublist Sublist
1
6 (avg. 6.0)
1 (100.0%)
0 (0.0%)
Resistor Color Trio Resistor Color Trio
2
33 (avg. 16.5)
1 (50.0%)
0 (0.0%)
50 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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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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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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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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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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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
111,780
Test Run Pass Rate
21.7% (24226)
Test Run Fail Rate
77.2% (86333)
Test Run Error Rate
1.1% (1221)

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.