2,588
students have developed their Perl skills on Exercism.

Students
2,588
Submissions
21,446
Mentoring Discussions
796

The Perl track needs attention ⚠️

Building

Build

Use your knowledge to build the Perl track itself

Build Test Runners

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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
16,069
Test Run Pass Rate
27.4% (4410)
Test Run Fail Rate
59.1% (9493)
Test Run Error Rate
13.5% (2166)

Build Analyzers

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

Next goal: Build an Analyzer. Find out more.

Build Representers

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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.

Create 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.

Next goal: Implement 129 practice exercises. Find out more.

Usage statistics

62 active practice exercises
Started
Attempts
Completions
Mentoring requests
Hello World Hello World
1,335
1,955 (avg. 1.5)
1,025 (76.8%)
3 (0.2%)
Accumulate Accumulate
455
2,821 (avg. 6.2)
204 (44.8%)
10 (2.2%)
All Your Base All Your Base
151
1,421 (avg. 9.4)
58 (38.4%)
6 (4.0%)
Allergies Allergies
144
646 (avg. 4.5)
86 (59.7%)
4 (2.8%)
Anagram Anagram
202
907 (avg. 4.5)
169 (83.7%)
25 (12.4%)
Atbash Cipher Atbash Cipher
102
546 (avg. 5.4)
83 (81.4%)
4 (3.9%)
Binary Search Binary Search
56
379 (avg. 6.8)
39 (69.6%)
1 (1.8%)
Binary Search Tree Binary Search Tree
44
114 (avg. 2.6)
21 (47.7%)
0 (0.0%)
Bob Bob
615
1,146 (avg. 1.9)
491 (79.8%)
129 (21.0%)
Clock Clock
120
399 (avg. 3.3)
85 (70.8%)
10 (8.3%)
Crypto Square Crypto Square
65
262 (avg. 4.0)
46 (70.8%)
1 (1.5%)
Custom Set Custom Set
35
185 (avg. 5.3)
18 (51.4%)
0 (0.0%)
Difference of Squares Difference of Squares
198
396 (avg. 2.0)
149 (75.3%)
24 (12.1%)
ETL ETL
211
406 (avg. 1.9)
180 (85.3%)
26 (12.3%)
Food Chain Food Chain
27
75 (avg. 2.8)
16 (59.3%)
0 (0.0%)
Gigasecond Gigasecond
61
193 (avg. 3.2)
45 (73.8%)
0 (0.0%)
Grade School Grade School
43
210 (avg. 4.9)
30 (69.8%)
2 (4.7%)
Grains Grains
325
561 (avg. 1.7)
298 (91.7%)
68 (20.9%)
Hamming Hamming
263
460 (avg. 1.7)
242 (92.0%)
45 (17.1%)
House House
51
165 (avg. 3.2)
37 (72.5%)
0 (0.0%)
Kindergarten Garden Kindergarten Garden
40
156 (avg. 3.9)
30 (75.0%)
1 (2.5%)
Largest Series Product Largest Series Product
46
216 (avg. 4.7)
34 (73.9%)
0 (0.0%)
Leap Leap
409
612 (avg. 1.5)
384 (93.9%)
75 (18.3%)
Linked List Linked List
52
58 (avg. 1.1)
34 (65.4%)
0 (0.0%)
List Ops List Ops
45
97 (avg. 2.2)
33 (73.3%)
1 (2.2%)
Luhn Luhn
53
165 (avg. 3.1)
45 (84.9%)
0 (0.0%)
Matrix Matrix
43
159 (avg. 3.7)
32 (74.4%)
1 (2.3%)
Meetup Meetup
32
178 (avg. 5.6)
23 (71.9%)
0 (0.0%)
Minesweeper Minesweeper
23
69 (avg. 3.0)
14 (60.9%)
0 (0.0%)
Nucleotide Count Nucleotide Count
47
337 (avg. 7.2)
37 (78.7%)
0 (0.0%)
OCR Numbers OCR Numbers
28
89 (avg. 3.2)
16 (57.1%)
1 (3.6%)
Palindrome Products Palindrome Products
27
144 (avg. 5.3)
17 (63.0%)
1 (3.7%)
Pascal's Triangle Pascal's Triangle
39
111 (avg. 2.8)
28 (71.8%)
0 (0.0%)
Phone Number Phone Number
87
289 (avg. 3.3)
71 (81.6%)
3 (3.4%)
Pig Latin Pig Latin
39
89 (avg. 2.3)
31 (79.5%)
0 (0.0%)
Prime Factors Prime Factors
99
134 (avg. 1.4)
82 (82.8%)
8 (8.1%)
Proverb Proverb
144
172 (avg. 1.2)
117 (81.3%)
14 (9.7%)
Pythagorean Triplet Pythagorean Triplet
25
117 (avg. 4.7)
13 (52.0%)
1 (4.0%)
Queen Attack Queen Attack
33
82 (avg. 2.5)
23 (69.7%)
3 (9.1%)
Raindrops Raindrops
280
475 (avg. 1.7)
262 (93.6%)
53 (18.9%)
RNA Transcription RNA Transcription
77
188 (avg. 2.4)
69 (89.6%)
4 (5.2%)
Robot Name Robot Name
80
198 (avg. 2.5)
63 (78.8%)
6 (7.5%)
Robot Simulator Robot Simulator
26
71 (avg. 2.7)
13 (50.0%)
0 (0.0%)
Roman Numerals Roman Numerals
112
143 (avg. 1.3)
92 (82.1%)
6 (5.4%)
Saddle Points Saddle Points
23
116 (avg. 5.0)
11 (47.8%)
0 (0.0%)
Say Say
30
58 (avg. 1.9)
18 (60.0%)
1 (3.3%)
Scrabble Score Scrabble Score
168
292 (avg. 1.7)
149 (88.7%)
26 (15.5%)
Secret Handshake Secret Handshake
35
116 (avg. 3.3)
26 (74.3%)
0 (0.0%)
Series Series
54
72 (avg. 1.3)
44 (81.5%)
1 (1.9%)
Sieve Sieve
32
78 (avg. 2.4)
24 (75.0%)
0 (0.0%)
Simple Cipher Simple Cipher
51
107 (avg. 2.1)
36 (70.6%)
1 (2.0%)
Simple Linked List Simple Linked List
25
48 (avg. 1.9)
12 (48.0%)
0 (0.0%)
Space Age Space Age
130
229 (avg. 1.8)
103 (79.2%)
10 (7.7%)
Strain Strain
42
56 (avg. 1.3)
35 (83.3%)
0 (0.0%)
Sublist Sublist
25
89 (avg. 3.6)
16 (64.0%)
0 (0.0%)
Sum of Multiples Sum of Multiples
32
260 (avg. 8.1)
24 (75.0%)
0 (0.0%)
Triangle Triangle
98
270 (avg. 2.8)
83 (84.7%)
8 (8.2%)
Twelve Days Twelve Days
30
193 (avg. 6.4)
19 (63.3%)
0 (0.0%)
Two Fer Two Fer
406
636 (avg. 1.6)
304 (74.9%)
186 (45.8%)
Word Count Word Count
183
380 (avg. 2.1)
154 (84.2%)
23 (12.6%)
Wordy Wordy
58
378 (avg. 6.5)
39 (67.2%)
2 (3.4%)
Bottle Song Bottle Song
7
58 (avg. 8.3)
6 (85.7%)
0 (0.0%)
5 deprecated practice exercises
Started
Attempts
Completions
Mentoring requests
Beer Song Beer Song
94
340 (avg. 3.6)
71 (75.5%)
3 (3.2%)
Binary Binary
5
5 (avg. 1.0)
5 (100.0%)
0 (0.0%)
Hexadecimal Hexadecimal
21
29 (avg. 1.4)
18 (85.7%)
0 (0.0%)
Point Mutations Point Mutations
1
1 (avg. 1.0)
1 (100.0%)
0 (0.0%)
Trinary Trinary
39
39 (avg. 1.0)
33 (84.6%)
2 (5.1%)
67 unimplemented practice exercises
Acronym Acronym
Affine Cipher Affine Cipher
Alphametics Alphametics
Armstrong Numbers Armstrong Numbers
Bank Account Bank Account
Book Store Book Store
Bowling Bowling
Change Change
Circular Buffer Circular Buffer
Collatz Conjecture Collatz Conjecture
Complex Numbers Complex Numbers
Connect Connect
D&D Character D&D Character
DOT DSL DOT DSL
Darts Darts
Diamond Diamond
Dominoes Dominoes
Error Handling Error Handling
Flatten Array Flatten Array
Forth Forth
Go Counting Go Counting
Grep Grep
Hangman Hangman
High Scores High Scores
ISBN Verifier ISBN Verifier
Isogram Isogram
Killer Sudoku Helper Killer Sudoku Helper
Knapsack Knapsack
Ledger Ledger
Lens Person Lens Person
Markdown Markdown
Matching Brackets Matching Brackets
Micro Blog Micro Blog
Nth Prime Nth Prime
POV POV
PaaS I/O PaaS I/O
Pangram Pangram
Parallel Letter Frequency Parallel Letter Frequency
Perfect Numbers Perfect Numbers
Poker Poker
Protein Translation Protein Translation
REST API REST API
Rail Fence Cipher Rail Fence Cipher
Rational Numbers Rational Numbers
React React
Rectangles Rectangles
Resistor Color Resistor Color
Resistor Color Duo Resistor Color Duo
Resistor Color Trio Resistor Color Trio
Reverse String Reverse String
Rotational Cipher Rotational Cipher
Run-Length Encoding Run-Length Encoding
SGF Parsing SGF Parsing
Satellite Satellite
Scale Generator Scale Generator
Spiral Matrix Spiral Matrix
Square Root Square Root
State of Tic-Tac-Toe State of Tic-Tac-Toe
Tournament Tournament
Transpose Transpose
Tree Building Tree Building
Two Bucket Two Bucket
Variable Length Quantity Variable Length Quantity
Word Search Word Search
Yacht Yacht
Zebra Puzzle Zebra Puzzle
Zipper Zipper