10,060
students have developed their Lua skills on Exercism.

Students
10,060
Submissions
72,998
Mentoring Discussions
1,366

The Lua track needs attention ⚠️

Building

Build

Use your knowledge to build the Lua 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
68,210
Test Run Pass Rate
20.8% (14178)
Test Run Fail Rate
51.7% (35271)
Test Run Error Rate
27.5% (18761)

Build Analyzers

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Build an Analyzer for Lua: 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 131 practice exercises. Find out more.

Usage statistics

82 active practice exercises
Started
Attempts
Completions
Mentoring requests
Hello World Hello World
7,207
23,903 (avg. 3.3)
4,632 (64.3%)
13 (0.2%)
Hamming Hamming
3,433
11,954 (avg. 3.5)
1,303 (38.0%)
343 (10.0%)
House House
1,662
4,979 (avg. 3.0)
563 (33.9%)
148 (8.9%)
Difference of Squares Difference of Squares
875
2,793 (avg. 3.2)
633 (72.3%)
88 (10.1%)
Binary Search Binary Search
475
3,307 (avg. 7.0)
280 (58.9%)
65 (13.7%)
Matrix Matrix
448
1,931 (avg. 4.3)
209 (46.7%)
56 (12.5%)
Isogram Isogram
371
1,557 (avg. 4.2)
259 (69.8%)
43 (11.6%)
Bank Account Bank Account
398
2,286 (avg. 5.7)
196 (49.2%)
34 (8.5%)
Nth Prime Nth Prime
186
797 (avg. 4.3)
113 (60.8%)
24 (12.9%)
Diamond Diamond
143
467 (avg. 3.3)
94 (65.7%)
21 (14.7%)
Run-Length Encoding Run-Length Encoding
128
410 (avg. 3.2)
82 (64.1%)
20 (15.6%)
Robot Name Robot Name
149
378 (avg. 2.5)
87 (58.4%)
19 (12.8%)
Leap Leap
297
1,038 (avg. 3.5)
217 (73.1%)
18 (6.1%)
Custom Set Custom Set
106
497 (avg. 4.7)
61 (57.5%)
11 (10.4%)
Pig Latin Pig Latin
78
256 (avg. 3.3)
39 (50.0%)
6 (7.7%)
List Ops List Ops
83
144 (avg. 1.7)
47 (56.6%)
8 (9.6%)
Binary Binary
155
741 (avg. 4.8)
108 (69.7%)
5 (3.2%)
Allergies Allergies
76
155 (avg. 2.0)
44 (57.9%)
6 (7.9%)
Resistor Color Trio Resistor Color Trio
246
724 (avg. 2.9)
172 (69.9%)
4 (1.6%)
Nucleotide Count Nucleotide Count
280
990 (avg. 3.5)
168 (60.0%)
30 (10.7%)
Protein Translation Protein Translation
143
433 (avg. 3.0)
103 (72.0%)
10 (7.0%)
RNA Transcription RNA Transcription
179
350 (avg. 2.0)
137 (76.5%)
14 (7.8%)
Scrabble Score Scrabble Score
181
600 (avg. 3.3)
119 (65.7%)
8 (4.4%)
Beer Song Beer Song
180
727 (avg. 4.0)
121 (67.2%)
12 (6.7%)
Food Chain Food Chain
104
269 (avg. 2.6)
67 (64.4%)
1 (1.0%)
Sum of Multiples Sum of Multiples
146
297 (avg. 2.0)
84 (57.5%)
5 (3.4%)
Collatz Conjecture Collatz Conjecture
121
467 (avg. 3.9)
82 (67.8%)
2 (1.7%)
Perfect Numbers Perfect Numbers
140
280 (avg. 2.0)
109 (77.9%)
9 (6.4%)
Pythagorean Triplet Pythagorean Triplet
108
224 (avg. 2.1)
57 (52.8%)
4 (3.7%)
Triangle Triangle
129
406 (avg. 3.1)
82 (63.6%)
4 (3.1%)
Largest Series Product Largest Series Product
61
114 (avg. 1.9)
36 (59.0%)
6 (9.8%)
Change Change
67
96 (avg. 1.4)
34 (50.7%)
1 (1.5%)
Binary Search Tree Binary Search Tree
72
91 (avg. 1.3)
33 (45.8%)
1 (1.4%)
Flatten Array Flatten Array
119
206 (avg. 1.7)
88 (73.9%)
16 (13.4%)
Matching Brackets Matching Brackets
128
301 (avg. 2.4)
96 (75.0%)
16 (12.5%)
POV POV
66
77 (avg. 1.2)
16 (24.2%)
0 (0.0%)
Minesweeper Minesweeper
55
114 (avg. 2.1)
23 (41.8%)
6 (10.9%)
OCR Numbers OCR Numbers
44
95 (avg. 2.2)
19 (43.2%)
4 (9.1%)
Transpose Transpose
48
99 (avg. 2.1)
18 (37.5%)
2 (4.2%)
Word Search Word Search
61
66 (avg. 1.1)
24 (39.3%)
3 (4.9%)
Alphametics Alphametics
65
291 (avg. 4.5)
14 (21.5%)
2 (3.1%)
React React
75
133 (avg. 1.8)
17 (22.7%)
1 (1.3%)
Rectangles Rectangles
53
182 (avg. 3.4)
13 (24.5%)
2 (3.8%)
Pangram Pangram
131
339 (avg. 2.6)
95 (72.5%)
11 (8.4%)
Word Count Word Count
181
543 (avg. 3.0)
116 (64.1%)
23 (12.7%)
Acronym Acronym
58
141 (avg. 2.4)
31 (53.4%)
4 (6.9%)
Anagram Anagram
171
473 (avg. 2.8)
127 (74.3%)
43 (25.1%)
Clock Clock
102
336 (avg. 3.3)
42 (41.2%)
11 (10.8%)
Grade School Grade School
75
180 (avg. 2.4)
50 (66.7%)
5 (6.7%)
Prime Factors Prime Factors
46
53 (avg. 1.2)
22 (47.8%)
3 (6.5%)
Sieve Sieve
51
79 (avg. 1.5)
27 (52.9%)
3 (5.9%)
Pascal's Triangle Pascal's Triangle
56
100 (avg. 1.8)
33 (58.9%)
0 (0.0%)
Atbash Cipher Atbash Cipher
62
238 (avg. 3.8)
31 (50.0%)
4 (6.5%)
ISBN Verifier ISBN Verifier
60
151 (avg. 2.5)
29 (48.3%)
2 (3.3%)
Luhn Luhn
63
165 (avg. 2.6)
38 (60.3%)
2 (3.2%)
Crypto Square Crypto Square
46
201 (avg. 4.4)
23 (50.0%)
1 (2.2%)
Variable Length Quantity Variable Length Quantity
105
229 (avg. 2.2)
61 (58.1%)
2 (1.9%)
Rail Fence Cipher Rail Fence Cipher
43
83 (avg. 1.9)
15 (34.9%)
0 (0.0%)
Robot Simulator Robot Simulator
84
204 (avg. 2.4)
37 (44.0%)
3 (3.6%)
Raindrops Raindrops
290
458 (avg. 1.6)
221 (76.2%)
31 (10.7%)
Gigasecond Gigasecond
76
76 (avg. 1.0)
44 (57.9%)
0 (0.0%)
Grains Grains
77
172 (avg. 2.2)
51 (66.2%)
2 (2.6%)
Space Age Space Age
76
122 (avg. 1.6)
36 (47.4%)
5 (6.6%)
Bob Bob
271
562 (avg. 2.1)
208 (76.8%)
31 (11.4%)
Secret Handshake Secret Handshake
49
146 (avg. 3.0)
20 (40.8%)
1 (2.0%)
Roman Numerals Roman Numerals
50
46 (avg. 0.9)
22 (44.0%)
2 (4.0%)
Rational Numbers Rational Numbers
33
86 (avg. 2.6)
13 (39.4%)
1 (3.0%)
Circular Buffer Circular Buffer
53
170 (avg. 3.2)
27 (50.9%)
7 (13.2%)
Linked List Linked List
58
208 (avg. 3.6)
28 (48.3%)
4 (6.9%)
Meetup Meetup
37
97 (avg. 2.6)
13 (35.1%)
1 (2.7%)
Say Say
37
86 (avg. 2.3)
11 (29.7%)
1 (2.7%)
ETL ETL
79
102 (avg. 1.3)
57 (72.2%)
2 (2.5%)
Queen Attack Queen Attack
61
163 (avg. 2.7)
20 (32.8%)
2 (3.3%)
Reverse String Reverse String
125
241 (avg. 1.9)
75 (60.0%)
2 (1.6%)
Series Series
46
140 (avg. 3.0)
24 (52.2%)
5 (10.9%)
Sublist Sublist
50
90 (avg. 1.8)
28 (56.0%)
3 (6.0%)
All Your Base All Your Base
47
133 (avg. 2.8)
21 (44.7%)
2 (4.3%)
Octal Octal
110
253 (avg. 2.3)
85 (77.3%)
16 (14.5%)
Phone Number Phone Number
133
468 (avg. 3.5)
64 (48.1%)
6 (4.5%)
Bowling Bowling
46
61 (avg. 1.3)
12 (26.1%)
2 (4.3%)
Kindergarten Garden Kindergarten Garden
49
111 (avg. 2.3)
24 (49.0%)
2 (4.1%)
Tournament Tournament
61
106 (avg. 1.7)
15 (24.6%)
1 (1.6%)
1 deprecated practice exercises
Started
Attempts
Completions
Mentoring requests
Accumulate Accumulate
102
161 (avg. 1.6)
102 (100.0%)
33 (32.4%)
49 unimplemented practice exercises
Affine Cipher Affine Cipher
Armstrong Numbers Armstrong Numbers
Book Store Book Store
Bottle Song Bottle Song
Complex Numbers Complex Numbers
Connect Connect
D&D Character D&D Character
DOT DSL DOT DSL
Darts Darts
Dominoes Dominoes
Error Handling Error Handling
Forth Forth
Go Counting Go Counting
Grep Grep
Hangman Hangman
High Scores High Scores
Killer Sudoku Helper Killer Sudoku Helper
Knapsack Knapsack
Ledger Ledger
Lens Person Lens Person
Markdown Markdown
Micro Blog Micro Blog
PaaS I/O PaaS I/O
Palindrome Products Palindrome Products
Parallel Letter Frequency Parallel Letter Frequency
Poker Poker
Proverb Proverb
REST API REST API
Resistor Color Resistor Color
Resistor Color Duo Resistor Color Duo
Rotational Cipher Rotational Cipher
SGF Parsing SGF Parsing
Saddle Points Saddle Points
Satellite Satellite
Scale Generator Scale Generator
Simple Cipher Simple Cipher
Simple Linked List Simple Linked List
Spiral Matrix Spiral Matrix
Square Root Square Root
State of Tic-Tac-Toe State of Tic-Tac-Toe
Strain Strain
Tree Building Tree Building
Twelve Days Twelve Days
Two Bucket Two Bucket
Two-Fer Two-Fer
Wordy Wordy
Yacht Yacht
Zebra Puzzle Zebra Puzzle
Zipper Zipper