R Track Management

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

Students
15,640
Submissions
123,834
Mentoring Discussions
1,616

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Building

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: 8126391045e1acb339564dc2ffce257718f91230 (Updates should be instant)

Next goal: Implement 137 practice exercises. Find out more.
82 active practice exercises
Started
Attempts
Completions
Mentoring requests
Hello World Hello World
9,912
19,734 (avg. 2.0)
6,740 (68.0%)
1 (0.0%)
Two Fer Two Fer
4,632
25,675 (avg. 5.5)
2,211 (47.7%)
428 (9.2%)
Leap Leap
2,469
9,399 (avg. 3.8)
1,764 (71.4%)
309 (12.5%)
Darts Darts
815
2,833 (avg. 3.5)
599 (73.5%)
19 (2.3%)
Raindrops Raindrops
1,839
10,249 (avg. 5.6)
1,474 (80.2%)
175 (9.5%)
Hamming Hamming
1,221
6,641 (avg. 5.4)
937 (76.7%)
158 (12.9%)
Phone Number Phone Number
828
7,459 (avg. 9.0)
545 (65.8%)
69 (8.3%)
Anagram Anagram
611
4,172 (avg. 6.8)
409 (66.9%)
67 (11.0%)
Word Count Word Count
569
3,191 (avg. 5.6)
322 (56.6%)
41 (7.2%)
Rotational Cipher Rotational Cipher
340
1,777 (avg. 5.2)
249 (73.2%)
27 (7.9%)
Tournament Tournament
356
2,607 (avg. 7.3)
170 (47.8%)
23 (6.5%)
Difference of Squares Difference of Squares
666
1,482 (avg. 2.2)
566 (85.0%)
46 (6.9%)
Grains Grains
469
1,300 (avg. 2.8)
379 (80.8%)
38 (8.1%)
Space Age Space Age
397
1,877 (avg. 4.7)
308 (77.6%)
24 (6.0%)
Collatz Conjecture Collatz Conjecture
324
1,658 (avg. 5.1)
249 (76.9%)
13 (4.0%)
Perfect Numbers Perfect Numbers
298
1,338 (avg. 4.5)
223 (74.8%)
28 (9.4%)
Sieve Sieve
234
888 (avg. 3.8)
165 (70.5%)
9 (3.8%)
Acronym Acronym
249
1,178 (avg. 4.7)
170 (68.3%)
12 (4.8%)
Fizz Buzz Fizz Buzz
273
1,082 (avg. 4.0)
218 (79.9%)
9 (3.3%)
Secret Handshake Secret Handshake
194
564 (avg. 2.9)
136 (70.1%)
11 (5.7%)
RNA Transcription RNA Transcription
325
849 (avg. 2.6)
247 (76.0%)
22 (6.8%)
ETL ETL
122
619 (avg. 5.1)
77 (63.1%)
2 (1.6%)
Allergies Allergies
194
566 (avg. 2.9)
122 (62.9%)
3 (1.5%)
Luhn Luhn
178
861 (avg. 4.8)
124 (69.7%)
6 (3.4%)
Bob Bob
261
1,225 (avg. 4.7)
186 (71.3%)
37 (14.2%)
Isogram Isogram
193
556 (avg. 2.9)
144 (74.6%)
4 (2.1%)
Pangram Pangram
168
471 (avg. 2.8)
131 (78.0%)
5 (3.0%)
Sum of Multiples Sum of Multiples
238
645 (avg. 2.7)
178 (74.8%)
26 (10.9%)
Beer Song Beer Song
150
720 (avg. 4.8)
101 (67.3%)
1 (0.7%)
Prime Factors Prime Factors
166
475 (avg. 2.9)
121 (72.9%)
3 (1.8%)
Triangle Triangle
183
827 (avg. 4.5)
94 (51.4%)
3 (1.6%)
Nucleotide Count Nucleotide Count
171
746 (avg. 4.4)
120 (70.2%)
4 (2.3%)
Scrabble Score Scrabble Score
160
415 (avg. 2.6)
121 (75.6%)
4 (2.5%)
Diamond Diamond
126
649 (avg. 5.2)
78 (61.9%)
2 (1.6%)
Largest Series Product Largest Series Product
171
716 (avg. 4.2)
123 (71.9%)
8 (4.7%)
Pascal's Triangle Pascal's Triangle
168
691 (avg. 4.1)
101 (60.1%)
7 (4.2%)
Crypto Square Crypto Square
179
1,940 (avg. 10.8)
101 (56.4%)
5 (2.8%)
Saddle Points Saddle Points
85
368 (avg. 4.3)
64 (75.3%)
2 (2.4%)
Complex Numbers Complex Numbers
13
28 (avg. 2.2)
6 (46.2%)
0 (0.0%)
Armstrong Numbers Armstrong Numbers
82
259 (avg. 3.2)
70 (85.4%)
2 (2.4%)
Queen Attack Queen Attack
66
289 (avg. 4.4)
46 (69.7%)
0 (0.0%)
Pythagorean Triplet Pythagorean Triplet
45
236 (avg. 5.2)
34 (75.6%)
1 (2.2%)
Reverse String Reverse String
81
248 (avg. 3.1)
64 (79.0%)
2 (2.5%)
Roman Numerals Roman Numerals
54
158 (avg. 2.9)
43 (79.6%)
1 (1.9%)
Protein Translation Protein Translation
49
446 (avg. 9.1)
34 (69.4%)
0 (0.0%)
Eliud's Eggs Eliud's Eggs
42
74 (avg. 1.8)
38 (90.5%)
0 (0.0%)
All Your Base All Your Base
65
595 (avg. 9.2)
46 (70.8%)
0 (0.0%)
Robot Simulator Robot Simulator
40
120 (avg. 3.0)
23 (57.5%)
0 (0.0%)
Series Series
22
74 (avg. 3.4)
19 (86.4%)
0 (0.0%)
Conway's Game of Life Conway's Game of Life
17
88 (avg. 5.2)
15 (88.2%)
0 (0.0%)
Gigasecond Gigasecond
18
28 (avg. 1.6)
14 (77.8%)
0 (0.0%)
Square Root Square Root
20
33 (avg. 1.7)
16 (80.0%)
0 (0.0%)
Knapsack Knapsack
15
68 (avg. 4.5)
12 (80.0%)
0 (0.0%)
High Scores High Scores
17
60 (avg. 3.5)
14 (82.4%)
0 (0.0%)
ISBN Verifier ISBN Verifier
17
111 (avg. 6.5)
12 (70.6%)
0 (0.0%)
Kindergarten Garden Kindergarten Garden
15
63 (avg. 4.2)
11 (73.3%)
0 (0.0%)
Atbash Cipher Atbash Cipher
14
73 (avg. 5.2)
11 (78.6%)
0 (0.0%)
Rail Fence Cipher Rail Fence Cipher
13
234 (avg. 18.0)
9 (69.2%)
0 (0.0%)
Flatten Array Flatten Array
15
44 (avg. 2.9)
14 (93.3%)
0 (0.0%)
Matching Brackets Matching Brackets
15
99 (avg. 6.6)
13 (86.7%)
0 (0.0%)
Matrix Matrix
17
138 (avg. 8.1)
12 (70.6%)
0 (0.0%)
Resistor Color Resistor Color
15
39 (avg. 2.6)
13 (86.7%)
0 (0.0%)
Resistor Color Duo Resistor Color Duo
13
36 (avg. 2.8)
12 (92.3%)
0 (0.0%)
Simple Cipher Simple Cipher
14
155 (avg. 11.1)
11 (78.6%)
0 (0.0%)
Strain Strain
13
97 (avg. 7.5)
11 (84.6%)
0 (0.0%)
Proverb Proverb
13
36 (avg. 2.8)
9 (69.2%)
0 (0.0%)
Zebra Puzzle Zebra Puzzle
16
81 (avg. 5.1)
7 (43.8%)
0 (0.0%)
Twelve Days Twelve Days
14
60 (avg. 4.3)
10 (71.4%)
0 (0.0%)
House House
12
62 (avg. 5.2)
9 (75.0%)
0 (0.0%)
Run-Length Encoding Run-Length Encoding
18
111 (avg. 6.2)
9 (50.0%)
0 (0.0%)
List Ops List Ops
13
122 (avg. 9.4)
7 (53.8%)
0 (0.0%)
D&D Character D&D Character
12
163 (avg. 13.6)
11 (91.7%)
0 (0.0%)
Binary Search Binary Search
15
39 (avg. 2.6)
11 (73.3%)
0 (0.0%)
Robot Name Robot Name
18
55 (avg. 3.1)
10 (55.6%)
0 (0.0%)
Food Chain Food Chain
16
224 (avg. 14.0)
9 (56.3%)
0 (0.0%)
Clock Clock
16
138 (avg. 8.6)
12 (75.0%)
0 (0.0%)
Nth Prime Nth Prime
19
145 (avg. 7.6)
13 (68.4%)
0 (0.0%)
Killer Sudoku Helper Killer Sudoku Helper
11
17 (avg. 1.5)
6 (54.5%)
0 (0.0%)
Change Change
11
40 (avg. 3.6)
5 (45.5%)
0 (0.0%)
Pig Latin Pig Latin
8
79 (avg. 9.9)
6 (75.0%)
0 (0.0%)
Sublist Sublist
8
34 (avg. 4.3)
4 (50.0%)
0 (0.0%)
Resistor Color Trio Resistor Color Trio
10
61 (avg. 6.1)
8 (80.0%)
0 (0.0%)
55 unimplemented practice exercises
Affine Cipher Affine Cipher
Alphametics Alphametics
Baffling Birthdays Baffling Birthdays
Bank Account Bank Account
Binary Search Tree Binary Search Tree
Book Store Book Store
Bottle Song Bottle Song
Bowling Bowling
Circular Buffer Circular Buffer
Connect Connect
Custom Set Custom Set
Dominoes Dominoes
DOT DSL DOT DSL
Error Handling Error Handling
Forth Forth
Go Counting Go Counting
Grade School Grade School
Grep Grep
Hangman Hangman
Intergalactic Transmission Intergalactic Transmission
Ledger Ledger
Lens Person Lens Person
Linked List Linked List
Markdown Markdown
Meetup Meetup
Micro Blog Micro Blog
Minesweeper Minesweeper
OCR Numbers OCR Numbers
PaaS I/O PaaS I/O
Palindrome Products Palindrome Products
Parallel Letter Frequency Parallel Letter Frequency
Piecing It Together Piecing It Together
Poker Poker
POV POV
Rational Numbers Rational Numbers
React React
Rectangles Rectangles
Relative Distance Relative Distance
REST API REST API
Satellite Satellite
Say Say
SGF Parsing SGF Parsing
Simple Linked List Simple Linked List
Spiral Matrix Spiral Matrix
Split-Second Stopwatch Split-Second Stopwatch
State of Tic-Tac-Toe State of Tic-Tac-Toe
Swift Scheduling Swift Scheduling
Transpose Transpose
Tree Building Tree Building
Two Bucket Two Bucket
Variable Length Quantity Variable Length Quantity
Word Search Word Search
Wordy Wordy
Yacht Yacht
Zipper Zipper

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
121,044
Test Run Pass Rate
21.7% (26262)
Test Run Fail Rate
77.2% (93492)
Test Run Error Rate
1.1% (1290)

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.