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

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453
Submissions
10,739
Mentoring Discussions
24

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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: 4f8ddda20e89cf3f47ea8bcbf94c86d392c45112 (Updates should be instant)

Next goal: Implement 131 practice exercises. Find out more.
91 active practice exercises
Started
Attempts
Completions
Mentoring requests
Hello World Hello World
409
530 (avg. 1.3)
322 (78.7%)
0 (0.0%)
Two Fer Two Fer
195
445 (avg. 2.3)
148 (75.9%)
2 (1.0%)
Leap Leap
114
396 (avg. 3.5)
106 (93.0%)
3 (2.6%)
Resistor Color Resistor Color
110
468 (avg. 4.3)
84 (76.4%)
1 (0.9%)
RNA Transcription RNA Transcription
69
322 (avg. 4.7)
61 (88.4%)
2 (2.9%)
Strain Strain
5
10 (avg. 2.0)
5 (100.0%)
0 (0.0%)
High Scores High Scores
63
677 (avg. 10.7)
52 (82.5%)
2 (3.2%)
Binary Search Binary Search
6
37 (avg. 6.2)
5 (83.3%)
0 (0.0%)
Collatz Conjecture Collatz Conjecture
50
285 (avg. 5.7)
47 (94.0%)
1 (2.0%)
Hamming Hamming
44
178 (avg. 4.0)
39 (88.6%)
2 (4.5%)
Triangle Triangle
35
266 (avg. 7.6)
32 (91.4%)
2 (5.7%)
Bank Account Bank Account
26
188 (avg. 7.2)
25 (96.2%)
0 (0.0%)
Acronym Acronym
25
199 (avg. 8.0)
21 (84.0%)
1 (4.0%)
Accumulate Accumulate
25
55 (avg. 2.2)
22 (88.0%)
0 (0.0%)
Grains Grains
27
123 (avg. 4.6)
25 (92.6%)
0 (0.0%)
Darts Darts
27
77 (avg. 2.9)
25 (92.6%)
1 (3.7%)
Difference of Squares Difference of Squares
24
105 (avg. 4.4)
23 (95.8%)
1 (4.2%)
Armstrong Numbers Armstrong Numbers
22
124 (avg. 5.6)
20 (90.9%)
1 (4.5%)
Eliud's Eggs Eliud's Eggs
5
8 (avg. 1.6)
5 (100.0%)
0 (0.0%)
Nucleotide Count Nucleotide Count
20
66 (avg. 3.3)
17 (85.0%)
0 (0.0%)
Protein Translation Protein Translation
19
162 (avg. 8.5)
17 (89.5%)
0 (0.0%)
Raindrops Raindrops
21
71 (avg. 3.4)
18 (85.7%)
0 (0.0%)
Resistor Color Duo Resistor Color Duo
17
54 (avg. 3.2)
15 (88.2%)
0 (0.0%)
Reverse String Reverse String
26
101 (avg. 3.9)
23 (88.5%)
1 (3.8%)
Scrabble Score Scrabble Score
16
73 (avg. 4.6)
15 (93.8%)
0 (0.0%)
Space Age Space Age
15
57 (avg. 3.8)
12 (80.0%)
0 (0.0%)
Matching Brackets Matching Brackets
15
60 (avg. 4.0)
13 (86.7%)
0 (0.0%)
Pangram Pangram
8
19 (avg. 2.4)
7 (87.5%)
0 (0.0%)
Word Count Word Count
14
107 (avg. 7.6)
11 (78.6%)
0 (0.0%)
D&D Character D&D Character
68
758 (avg. 11.1)
62 (91.2%)
0 (0.0%)
ETL ETL
5
13 (avg. 2.6)
5 (100.0%)
0 (0.0%)
Isogram Isogram
13
49 (avg. 3.8)
12 (92.3%)
0 (0.0%)
Yacht Yacht
5
18 (avg. 3.6)
3 (60.0%)
0 (0.0%)
Binary Binary
20
105 (avg. 5.3)
20 (100.0%)
1 (5.0%)
Flatten Array Flatten Array
69
385 (avg. 5.6)
65 (94.2%)
0 (0.0%)
Allergies Allergies
16
47 (avg. 2.9)
14 (87.5%)
0 (0.0%)
Bob Bob
14
49 (avg. 3.5)
11 (78.6%)
1 (7.1%)
Anagram Anagram
11
73 (avg. 6.6)
8 (72.7%)
0 (0.0%)
Roman Numerals Roman Numerals
13
32 (avg. 2.5)
10 (76.9%)
0 (0.0%)
ISBN Verifier ISBN Verifier
13
61 (avg. 4.7)
11 (84.6%)
0 (0.0%)
Resistor Color Trio Resistor Color Trio
11
91 (avg. 8.3)
8 (72.7%)
0 (0.0%)
Square Root Square Root
13
38 (avg. 2.9)
10 (76.9%)
0 (0.0%)
Twelve Days Twelve Days
9
48 (avg. 5.3)
7 (77.8%)
0 (0.0%)
Beer Song Beer Song
9
43 (avg. 4.8)
6 (66.7%)
0 (0.0%)
Diamond Diamond
14
40 (avg. 2.9)
8 (57.1%)
0 (0.0%)
Luhn Luhn
11
49 (avg. 4.5)
7 (63.6%)
0 (0.0%)
Clock Clock
9
69 (avg. 7.7)
6 (66.7%)
0 (0.0%)
Pig Latin Pig Latin
5
29 (avg. 5.8)
3 (60.0%)
0 (0.0%)
Pythagorean Triplet Pythagorean Triplet
5
6 (avg. 1.2)
4 (80.0%)
0 (0.0%)
Sieve Sieve
8
51 (avg. 6.4)
5 (62.5%)
0 (0.0%)
Rotational Cipher Rotational Cipher
5
7 (avg. 1.4)
4 (80.0%)
0 (0.0%)
Perfect Numbers Perfect Numbers
5
19 (avg. 3.8)
5 (100.0%)
0 (0.0%)
Secret Handshake Secret Handshake
3
19 (avg. 6.3)
3 (100.0%)
0 (0.0%)
Largest Series Product Largest Series Product
3
24 (avg. 8.0)
3 (100.0%)
0 (0.0%)
Phone Number Phone Number
3
61 (avg. 20.3)
2 (66.7%)
0 (0.0%)
Custom Set Custom Set
13
88 (avg. 6.8)
8 (61.5%)
1 (7.7%)
Run-Length Encoding Run-Length Encoding
55
567 (avg. 10.3)
50 (90.9%)
0 (0.0%)
Bottle Song Bottle Song
4
28 (avg. 7.0)
3 (75.0%)
0 (0.0%)
Atbash Cipher Atbash Cipher
7
49 (avg. 7.0)
5 (71.4%)
0 (0.0%)
Nth Prime Nth Prime
5
15 (avg. 3.0)
5 (100.0%)
0 (0.0%)
Robot Simulator Robot Simulator
10
30 (avg. 3.0)
8 (80.0%)
0 (0.0%)
Crypto Square Crypto Square
4
32 (avg. 8.0)
3 (75.0%)
0 (0.0%)
Spiral Matrix Spiral Matrix
4
68 (avg. 17.0)
3 (75.0%)
0 (0.0%)
Pascal's Triangle Pascal's Triangle
5
14 (avg. 2.8)
4 (80.0%)
0 (0.0%)
Queen Attack Queen Attack
57
973 (avg. 17.1)
51 (89.5%)
0 (0.0%)
Affine Cipher Affine Cipher
5
52 (avg. 10.4)
2 (40.0%)
0 (0.0%)
Robot Name Robot Name
7
14 (avg. 2.0)
4 (57.1%)
0 (0.0%)
Food Chain Food Chain
3
54 (avg. 18.0)
2 (66.7%)
0 (0.0%)
Simple Linked List Simple Linked List
9
21 (avg. 2.3)
5 (55.6%)
0 (0.0%)
Grade School Grade School
4
8 (avg. 2.0)
2 (50.0%)
0 (0.0%)
Killer Sudoku Helper Killer Sudoku Helper
5
17 (avg. 3.4)
4 (80.0%)
0 (0.0%)
Circular Buffer Circular Buffer
11
46 (avg. 4.2)
7 (63.6%)
0 (0.0%)
Binary Search Tree Binary Search Tree
6
14 (avg. 2.3)
3 (50.0%)
0 (0.0%)
Simple Cipher Simple Cipher
4
27 (avg. 6.8)
3 (75.0%)
0 (0.0%)
Wordy Wordy
5
39 (avg. 7.8)
2 (40.0%)
0 (0.0%)
Kindergarten Garden Kindergarten Garden
4
11 (avg. 2.8)
3 (75.0%)
0 (0.0%)
Rational Numbers Rational Numbers
6
38 (avg. 6.3)
4 (66.7%)
0 (0.0%)
Two Bucket Two Bucket
6
42 (avg. 7.0)
3 (50.0%)
0 (0.0%)
Complex Numbers Complex Numbers
5
29 (avg. 5.8)
4 (80.0%)
0 (0.0%)
Knapsack Knapsack
4
13 (avg. 3.3)
3 (75.0%)
0 (0.0%)
Linked List Linked List
7
59 (avg. 8.4)
4 (57.1%)
0 (0.0%)
All Your Base All Your Base
52
504 (avg. 9.7)
48 (92.3%)
0 (0.0%)
Minesweeper Minesweeper
9
43 (avg. 4.8)
6 (66.7%)
0 (0.0%)
Grep Grep
4
41 (avg. 10.3)
3 (75.0%)
0 (0.0%)
Rail Fence Cipher Rail Fence Cipher
5
37 (avg. 7.4)
4 (80.0%)
0 (0.0%)
Rectangles Rectangles
6
12 (avg. 2.0)
4 (66.7%)
0 (0.0%)
Change Change
7
8 (avg. 1.1)
4 (57.1%)
0 (0.0%)
Forth Forth
14
47 (avg. 3.4)
4 (28.6%)
1 (7.1%)
List Ops List Ops
11
190 (avg. 17.3)
8 (72.7%)
0 (0.0%)
Parallel Letter Frequency Parallel Letter Frequency
5
38 (avg. 7.6)
2 (40.0%)
0 (0.0%)
Zebra Puzzle Zebra Puzzle
3
24 (avg. 8.0)
2 (66.7%)
0 (0.0%)
40 unimplemented practice exercises
Alphametics Alphametics
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Book Store Book Store
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Bowling Bowling
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Connect Connect
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Conway's Game of Life Conway's Game of Life
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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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Gigasecond Gigasecond
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Go Counting Go Counting
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Hangman Hangman
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House House
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Ledger Ledger
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Lens Person Lens Person
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Markdown Markdown
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Matrix Matrix
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Micro Blog Micro Blog
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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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Poker Poker
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POV POV
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Prime Factors Prime Factors
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Proverb Proverb
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React React
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REST API REST API
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Saddle Points Saddle Points
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Satellite Satellite
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Say Say
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Series Series
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SGF Parsing SGF Parsing
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State of Tic-Tac-Toe State of Tic-Tac-Toe
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Sublist Sublist
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Sum of Multiples Sum of Multiples
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Tournament Tournament
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Transpose Transpose
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Tree Building Tree Building
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Variable Length Quantity Variable Length Quantity
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Word Search Word Search
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Zipper Zipper
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1 foregone practice exercise
Meetup Meetup
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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: be1a415b7510c9a7779568187e59b1d105f39a47 (Takes up to 10 mins to deploy)

Total Test Runner Runs
10,685
Test Run Pass Rate
28.1% (3001)
Test Run Fail Rate
50.2% (5367)
Test Run Error Rate
21.7% (2317)

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.

Current version: 73cb7b62d314b69d2f85e436aa1c31e30c93fe8d (Takes up to 10 mins to deploy)

Total Representer Runs
2,277
Total Representation Comments Made
0
Feedback Given Frequency
0.0%

Analyzer

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Build an Analyzer for Wren: Exercism's analyzers automatically assess student's submissions and provide mentor-style commentary.

Next goal: Build an Analyzer. Find out more.