225
students have developed their Wren skills on Exercism.

Students
225
Submissions
3,913
Mentoring Discussions
19

The Wren track needs attention ⚠️

Building

Build

Use your knowledge to build the Wren track itself

Build Test Runners

Learn More

Create Test Runners that have the single responsibility of taking a solution, running all tests and returning a standardized output.

Usage statistics

Total Test Runner Runs
3,890
Test Run Pass Rate
32.4% (1259)
Test Run Fail Rate
47.6% (1852)
Test Run Error Rate
20.0% (779)

Build Analyzers

Learn More

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.

Build Representers

Learn More

Build a Representer: a bit of code that has the single responsibility of taking a solution and returning a normalized representation of it.

Usage statistics

Total Representer Runs
968
Total Representation Comments Made
0
Feedback Given Frequency
0.0%

Create Practice Exercises

Learn More

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.

Next goal: Implement 131 practice exercises. Find out more.

Usage statistics

67 active practice exercises
Started
Attempts
Completions
Mentoring requests
Hello World Hello World
172
284 (avg. 1.7)
143 (83.1%)
0 (0.0%)
Two Fer Two Fer
107
283 (avg. 2.6)
78 (72.9%)
1 (0.9%)
Leap Years Leap Years
48
200 (avg. 4.2)
45 (93.8%)
2 (4.2%)
Resistor Color Resistor Color
63
286 (avg. 4.5)
43 (68.3%)
0 (0.0%)
RNA Transcription RNA Transcription
31
134 (avg. 4.3)
25 (80.6%)
2 (6.5%)
High Scores High Scores
34
413 (avg. 12.1)
26 (76.5%)
2 (5.9%)
Collatz Conjecture Collatz Conjecture
19
129 (avg. 6.8)
19 (100.0%)
1 (5.3%)
Hamming Hamming
20
92 (avg. 4.6)
19 (95.0%)
2 (10.0%)
Triangle Triangle
15
130 (avg. 8.7)
15 (100.0%)
2 (13.3%)
Bank Account Bank Account
15
99 (avg. 6.6)
13 (86.7%)
0 (0.0%)
Acronym Acronym
15
126 (avg. 8.4)
11 (73.3%)
1 (6.7%)
Accumulate Accumulate
14
27 (avg. 1.9)
12 (85.7%)
0 (0.0%)
Grains Grains
13
52 (avg. 4.0)
12 (92.3%)
0 (0.0%)
Darts Darts
13
26 (avg. 2.0)
11 (84.6%)
0 (0.0%)
Difference of Squares Difference of Squares
8
30 (avg. 3.8)
7 (87.5%)
0 (0.0%)
Armstrong Numbers Armstrong Numbers
13
70 (avg. 5.4)
11 (84.6%)
1 (7.7%)
Nucleotide Count Nucleotide Count
13
38 (avg. 2.9)
9 (69.2%)
0 (0.0%)
Protein Translation Protein Translation
10
78 (avg. 7.8)
8 (80.0%)
0 (0.0%)
Raindrops Raindrops
11
32 (avg. 2.9)
9 (81.8%)
0 (0.0%)
Resistor Color Duo Resistor Color Duo
10
35 (avg. 3.5)
9 (90.0%)
0 (0.0%)
Reverse String Reverse String
12
40 (avg. 3.3)
10 (83.3%)
1 (8.3%)
Scrabble Score Scrabble Score
9
36 (avg. 4.0)
8 (88.9%)
0 (0.0%)
Space Age Space Age
9
33 (avg. 3.7)
7 (77.8%)
0 (0.0%)
Matching Brackets Matching Brackets
9
19 (avg. 2.1)
7 (77.8%)
0 (0.0%)
Word Count Word Count
10
57 (avg. 5.7)
7 (70.0%)
0 (0.0%)
D&D Character D&D Character
15
134 (avg. 8.9)
12 (80.0%)
0 (0.0%)
Isogram Isogram
5
29 (avg. 5.8)
5 (100.0%)
0 (0.0%)
Binary Binary
14
80 (avg. 5.7)
14 (100.0%)
1 (7.1%)
Flatten Array Flatten Array
14
48 (avg. 3.4)
13 (92.9%)
0 (0.0%)
Allergies Allergies
12
32 (avg. 2.7)
10 (83.3%)
0 (0.0%)
Bob Bob
10
28 (avg. 2.8)
8 (80.0%)
1 (10.0%)
Anagram Anagram
8
48 (avg. 6.0)
5 (62.5%)
0 (0.0%)
Roman Numerals Roman Numerals
7
7 (avg. 1.0)
5 (71.4%)
0 (0.0%)
ISBN Verifier ISBN Verifier
8
22 (avg. 2.8)
6 (75.0%)
0 (0.0%)
Resistor Color Trio Resistor Color Trio
8
48 (avg. 6.0)
5 (62.5%)
0 (0.0%)
Square Root Square Root
5
19 (avg. 3.8)
3 (60.0%)
0 (0.0%)
Twelve Days Twelve Days
6
16 (avg. 2.7)
4 (66.7%)
0 (0.0%)
Beer Song Beer Song
7
9 (avg. 1.3)
4 (57.1%)
0 (0.0%)
Diamond Diamond
7
3 (avg. 0.4)
3 (42.9%)
0 (0.0%)
Luhn Luhn
5
10 (avg. 2.0)
3 (60.0%)
0 (0.0%)
Clock Clock
4
6 (avg. 1.5)
2 (50.0%)
0 (0.0%)
Pig Latin Pig Latin
4
17 (avg. 4.3)
2 (50.0%)
0 (0.0%)
Sieve Sieve
4
6 (avg. 1.5)
2 (50.0%)
0 (0.0%)
Custom Set Custom Set
10
49 (avg. 4.9)
5 (50.0%)
1 (10.0%)
Run Length Encoding Run Length Encoding
7
53 (avg. 7.6)
4 (57.1%)
0 (0.0%)
Atbash Cipher Atbash Cipher
5
5 (avg. 1.0)
3 (60.0%)
0 (0.0%)
Robot Simulator Robot Simulator
8
21 (avg. 2.6)
6 (75.0%)
0 (0.0%)
Spiral Matrix Spiral Matrix
3
17 (avg. 5.7)
2 (66.7%)
0 (0.0%)
Queen Attack Queen Attack
7
85 (avg. 12.1)
4 (57.1%)
0 (0.0%)
Affine Cipher Affine Cipher
4
28 (avg. 7.0)
1 (25.0%)
0 (0.0%)
Robot Name Robot Name
5
2 (avg. 0.4)
2 (40.0%)
0 (0.0%)
Simple Linked List Simple Linked List
7
14 (avg. 2.0)
3 (42.9%)
0 (0.0%)
Grade School Grade School
3
2 (avg. 0.7)
1 (33.3%)
0 (0.0%)
Circular Buffer Circular Buffer
7
42 (avg. 6.0)
5 (71.4%)
0 (0.0%)
Binary Search Tree Binary Search Tree
4
2 (avg. 0.5)
1 (25.0%)
0 (0.0%)
Simple Cipher Simple Cipher
3
13 (avg. 4.3)
2 (66.7%)
0 (0.0%)
Wordy Wordy
4
10 (avg. 2.5)
1 (25.0%)
0 (0.0%)
Rational Numbers Rational Numbers
4
31 (avg. 7.8)
2 (50.0%)
0 (0.0%)
Two Bucket Two Bucket
4
4 (avg. 1.0)
1 (25.0%)
0 (0.0%)
Complex Numbers Complex Numbers
3
20 (avg. 6.7)
2 (66.7%)
0 (0.0%)
Linked List Linked List
4
4 (avg. 1.0)
1 (25.0%)
0 (0.0%)
Minesweeper Minesweeper
6
25 (avg. 4.2)
4 (66.7%)
0 (0.0%)
Grep Grep
3
25 (avg. 8.3)
2 (66.7%)
0 (0.0%)
Rectangles Rectangles
4
5 (avg. 1.3)
2 (50.0%)
0 (0.0%)
Change Change
4
2 (avg. 0.5)
2 (50.0%)
0 (0.0%)
Forth Forth
12
24 (avg. 2.0)
1 (8.3%)
1 (8.3%)
List Ops List Ops
5
119 (avg. 23.8)
5 (100.0%)
0 (0.0%)
64 unimplemented practice exercises
All Your Base All Your Base
Alphametics Alphametics
Binary Search Binary Search
Book Store Book Store
Bottle Song Bottle Song
Bowling Bowling
Connect Connect
Crypto Square Crypto Square
DOT DSL DOT DSL
Dominoes Dominoes
ETL ETL
Error Handling Error Handling
Food Chain Food Chain
Gigasecond Gigasecond
Go Counting Go Counting
Hangman Hangman
House House
Killer Sudoku Helper Killer Sudoku Helper
Kindergarten Garden Kindergarten Garden
Knapsack Knapsack
Largest Series Product Largest Series Product
Ledger Ledger
Lens Person Lens Person
Markdown Markdown
Matrix Matrix
Meetup Meetup
Micro Blog Micro Blog
Nth Prime Nth Prime
OCR Numbers OCR Numbers
POV POV
PaaS I/O PaaS I/O
Palindrome Products Palindrome Products
Pangram Pangram
Parallel Letter Frequency Parallel Letter Frequency
Pascal's Triangle Pascal's Triangle
Perfect Numbers Perfect Numbers
Phone Number Phone Number
Poker Poker
Prime Factors Prime Factors
Proverb Proverb
Pythagorean Triplet Pythagorean Triplet
REST API REST API
Rail Fence Cipher Rail Fence Cipher
React React
Rotational Cipher Rotational Cipher
SGF Parsing SGF Parsing
Saddle Points Saddle Points
Satellite Satellite
Say Say
Scale Generator Scale Generator
Secret Handshake Secret Handshake
Series Series
State of Tic-Tac-Toe State of Tic-Tac-Toe
Strain Strain
Sublist Sublist
Sum of Multiples Sum of Multiples
Tournament Tournament
Transpose Transpose
Tree Building Tree Building
Variable Length Quantity Variable Length Quantity
Word Search Word Search
Yacht Yacht
Zebra Puzzle Zebra Puzzle
Zipper Zipper