Ballerina
Ballerina
About BallerinaPractice

Ballerina Track Management

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

Students
1,204
Submissions
6,340
Mentoring Discussions
49

The Ballerina track needs attention ⚠️

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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: 82dcd24e2de0788a507724eb95ac466fb0562e7c (Updates should be instant)

Next goal: Implement 141 practice exercises. Find out more.
50 active practice exercises
Started
Attempts
Completions
Mentoring requests
Hello World Hello World
668
1,014 (avg. 1.5)
445 (66.6%)
0 (0.0%)
Calculator Service Calculator Service
273
1,200 (avg. 4.4)
153 (56.0%)
9 (3.3%)
Echo Service Echo Service
172
364 (avg. 2.1)
140 (81.4%)
4 (2.3%)
Service Error Handling Service Error Handling
124
708 (avg. 5.7)
103 (83.1%)
1 (0.8%)
Greeting Service Greeting Service
163
500 (avg. 3.1)
143 (87.7%)
7 (4.3%)
Hello World Service Hello World Service
194
305 (avg. 1.6)
156 (80.4%)
15 (7.7%)
Service Composition Service Composition
80
211 (avg. 2.6)
58 (72.5%)
0 (0.0%)
Service Invocation Service Invocation
12
15 (avg. 1.3)
7 (58.3%)
5 (41.7%)
CSV Fuel Allowance CSV Fuel Allowance
53
86 (avg. 1.6)
45 (84.9%)
0 (0.0%)
JSON Fuel Allowance JSON Fuel Allowance
58
100 (avg. 1.7)
46 (79.3%)
1 (1.7%)
XML Fuel Allowance XML Fuel Allowance
35
122 (avg. 3.5)
11 (31.4%)
0 (0.0%)
Monitor Rush Monitor Rush
40
65 (avg. 1.6)
38 (95.0%)
0 (0.0%)
The Cake is a Lie The Cake is a Lie
10
32 (avg. 3.2)
5 (50.0%)
0 (0.0%)
PaySwitch - Salary Converter PaySwitch - Salary Converter
7
10 (avg. 1.4)
5 (71.4%)
0 (0.0%)
Isogram Isogram
50
153 (avg. 3.1)
43 (86.0%)
0 (0.0%)
Raindrops Raindrops
43
111 (avg. 2.6)
38 (88.4%)
2 (4.7%)
Roman Numerals Roman Numerals
45
177 (avg. 3.9)
38 (84.4%)
1 (2.2%)
Space Age Space Age
39
149 (avg. 3.8)
37 (94.9%)
0 (0.0%)
Acronym Acronym
55
201 (avg. 3.7)
46 (83.6%)
1 (1.8%)
Sieve Sieve
10
13 (avg. 1.3)
7 (70.0%)
0 (0.0%)
Bob Bob
10
16 (avg. 1.6)
7 (70.0%)
0 (0.0%)
Collatz Conjecture Collatz Conjecture
12
38 (avg. 3.2)
9 (75.0%)
0 (0.0%)
Grains Grains
11
30 (avg. 2.7)
9 (81.8%)
0 (0.0%)
Knapsack Knapsack
6
8 (avg. 1.3)
4 (66.7%)
0 (0.0%)
Hamming Hamming
11
12 (avg. 1.1)
8 (72.7%)
0 (0.0%)
Difference Of Squares Difference Of Squares
14
21 (avg. 1.5)
13 (92.9%)
0 (0.0%)
Leap Leap
28
65 (avg. 2.3)
26 (92.9%)
0 (0.0%)
Darts Darts
11
16 (avg. 1.5)
10 (90.9%)
0 (0.0%)
Two Fer Two Fer
13
34 (avg. 2.6)
10 (76.9%)
0 (0.0%)
Pangram Pangram
13
39 (avg. 3.0)
11 (84.6%)
0 (0.0%)
Anagram Anagram
8
14 (avg. 1.8)
6 (75.0%)
1 (12.5%)
Protein Translation Protein Translation
12
42 (avg. 3.5)
9 (75.0%)
1 (8.3%)
ETL ETL
9
14 (avg. 1.6)
7 (77.8%)
1 (11.1%)
Two Bucket Two Bucket
5
6 (avg. 1.2)
4 (80.0%)
1 (20.0%)
Binary Search Binary Search
12
39 (avg. 3.3)
10 (83.3%)
0 (0.0%)
Linked List Linked List
8
7 (avg. 0.9)
5 (62.5%)
0 (0.0%)
Largest Series Product Largest Series Product
7
14 (avg. 2.0)
7 (100.0%)
0 (0.0%)
Robot Simulator Robot Simulator
5
4 (avg. 0.8)
4 (80.0%)
0 (0.0%)
Saddle Points Saddle Points
7
7 (avg. 1.0)
5 (71.4%)
1 (14.3%)
Sum Of Multiples Sum Of Multiples
9
25 (avg. 2.8)
8 (88.9%)
0 (0.0%)
Secret Handshake Secret Handshake
7
10 (avg. 1.4)
6 (85.7%)
0 (0.0%)
Yacht Yacht
7
63 (avg. 9.0)
6 (85.7%)
0 (0.0%)
Reverse String Reverse String
7
38 (avg. 5.4)
3 (42.9%)
0 (0.0%)
Allergies Allergies
1
0 (avg. 0.0)
0 (0.0%)
0 (0.0%)
RNA Transcription RNA Transcription
2
4 (avg. 2.0)
2 (100.0%)
0 (0.0%)
scrabble score scrabble score
2
4 (avg. 2.0)
2 (100.0%)
0 (0.0%)
Eliud's Eggs Eliud's Eggs
1
1 (avg. 1.0)
1 (100.0%)
0 (0.0%)
Circular Buffer Circular Buffer
1
0 (avg. 0.0)
0 (0.0%)
0 (0.0%)
List Ops List Ops
1
0 (avg. 0.0)
0 (0.0%)
0 (0.0%)
D&D Character D&D Character
1
0 (avg. 0.0)
0 (0.0%)
0 (0.0%)
2 deprecated practice exercises
Started
Attempts
Completions
Mentoring requests
Legacy Service Client Legacy Service Client
5
6 (avg. 1.2)
4 (80.0%)
2 (40.0%)
Order Management Order Management
1
1 (avg. 1.0)
1 (100.0%)
0 (0.0%)
91 unimplemented practice exercises
Affine Cipher Affine Cipher
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All Your Base All Your Base
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Alphametics Alphametics
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Armstrong Numbers Armstrong Numbers
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Atbash Cipher Atbash Cipher
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Bank Account Bank Account
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Binary Search Tree Binary Search Tree
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Book Store Book Store
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Bottle Song Bottle Song
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Bowling Bowling
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Change Change
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Clock Clock
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Complex Numbers Complex Numbers
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Connect Connect
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Conway's Game of Life Conway's Game of Life
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Crypto Square Crypto Square
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Custom Set Custom Set
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Diamond Diamond
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Dominoes Dominoes
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DOT DSL DOT DSL
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Flatten Array Flatten Array
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Food Chain Food Chain
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Forth Forth
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Gigasecond Gigasecond
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Go Counting Go Counting
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Grade School Grade School
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Grep Grep
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Hangman Hangman
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High Scores High Scores
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House House
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ISBN Verifier ISBN Verifier
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Killer Sudoku Helper Killer Sudoku Helper
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Kindergarten Garden Kindergarten Garden
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Ledger Ledger
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Lens Person Lens Person
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Luhn Luhn
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Markdown Markdown
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Matching Brackets Matching Brackets
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Matrix Matrix
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Meetup Meetup
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Micro Blog Micro Blog
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Minesweeper Minesweeper
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Nth Prime Nth Prime
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Nucleotide Count Nucleotide Count
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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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Parallel Letter Frequency Parallel Letter Frequency
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Pascal's Triangle Pascal's Triangle
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Perfect Numbers Perfect Numbers
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Phone Number Phone Number
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Pig Latin Pig Latin
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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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Pythagorean Triplet Pythagorean Triplet
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Queen Attack Queen Attack
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Rail Fence Cipher Rail Fence Cipher
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Rational Numbers Rational Numbers
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React React
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Rectangles Rectangles
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Resistor Color Resistor Color
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Resistor Color Duo Resistor Color Duo
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Resistor Color Trio Resistor Color Trio
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REST API REST API
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Robot Name Robot Name
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Rotational Cipher Rotational Cipher
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Run-Length Encoding Run-Length Encoding
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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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Simple Cipher Simple Cipher
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Simple Linked List Simple Linked List
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Spiral Matrix Spiral Matrix
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Square Root Square Root
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State of Tic-Tac-Toe State of Tic-Tac-Toe
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Strain Strain
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Sublist Sublist
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Tournament Tournament
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Transpose Transpose
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Tree Building Tree Building
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Triangle Triangle
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Twelve Days Twelve Days
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Variable Length Quantity Variable Length Quantity
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Word Count Word Count
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Word Search Word Search
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Wordy Wordy
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Zebra Puzzle Zebra Puzzle
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Zipper Zipper
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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: c9d5c615c66e6d2ecb90dfdbc48d1d074d82dc2a (Takes up to 10 mins to deploy)

Next goal: Get Test Runners to Version 2. Ballerina is currently utilising a Version 1 Test Runner. Find out more.
Total Test Runner Runs
6,203
Test Run Pass Rate
33.2% (2059)
Test Run Fail Rate
53.0% (3285)
Test Run Error Rate
13.8% (859)

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 Ballerina: Exercism's analyzers automatically assess student's submissions and provide mentor-style commentary.

Next goal: Build an Analyzer. Find out more.