706
students have developed their Ballerina skills on Exercism.

Students
706
Submissions
1,076
Mentoring Discussions
30

The Ballerina track needs attention ⚠️

Building

Build

Use your knowledge to build the Ballerina 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.

Next goal: Get Test Runners to Version 2. Ballerina is currently utilising a Version 1 Test Runner. Find out more.

Usage statistics

Total Test Runner Runs
903
Test Run Pass Rate
26.5% (239)
Test Run Fail Rate
54.7% (494)
Test Run Error Rate
18.8% (170)

Build Analyzers

Learn More

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.

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.

Next goal: Build a Representer. Find out more.

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 at least 20 practice exercises. Find out more.

Usage statistics

12 active practice exercises
Started
Attempts
Completions
Mentoring requests
Hello World Hello World
219
262 (avg. 1.2)
132 (60.3%)
0 (0.0%)
Calculator Service Calculator Service
56
218 (avg. 3.9)
23 (41.1%)
2 (3.6%)
Echo Service Echo Service
45
67 (avg. 1.5)
30 (66.7%)
3 (6.7%)
Service Error Handling Service Error Handling
21
131 (avg. 6.2)
16 (76.2%)
1 (4.8%)
Greeting Service Greeting Service
50
140 (avg. 2.8)
36 (72.0%)
7 (14.0%)
Hello World Service Hello World Service
74
101 (avg. 1.4)
40 (54.1%)
15 (20.3%)
Service Composition Service Composition
12
26 (avg. 2.2)
3 (25.0%)
0 (0.0%)
Service Invocation Service Invocation
12
15 (avg. 1.3)
7 (58.3%)
5 (41.7%)
CSV Fuel Allowance CSV Fuel Allowance
3
3 (avg. 1.0)
2 (66.7%)
0 (0.0%)
JSON Fuel Allowance JSON Fuel Allowance
10
16 (avg. 1.6)
3 (30.0%)
0 (0.0%)
XML Fuel Allowance XML Fuel Allowance
3
1 (avg. 0.3)
1 (33.3%)
0 (0.0%)
Monitor Rush Monitor Rush
5
16 (avg. 3.2)
4 (80.0%)
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%)
126 unimplemented practice exercises
Acronym Acronym
Affine Cipher Affine Cipher
All Your Base All Your Base
Allergies Allergies
Alphametics Alphametics
Anagram Anagram
Armstrong Numbers Armstrong Numbers
Atbash Cipher Atbash Cipher
Bank Account Bank Account
Binary Search Binary Search
Binary Search Tree Binary Search Tree
Bob Bob
Book Store Book Store
Bottle Song Bottle Song
Bowling Bowling
Change Change
Circular Buffer Circular Buffer
Clock Clock
Collatz Conjecture Collatz Conjecture
Complex Numbers Complex Numbers
Connect Connect
Crypto Square Crypto Square
Custom Set Custom Set
D&D Character D&D Character
DOT DSL DOT DSL
Darts Darts
Diamond Diamond
Difference of Squares Difference of Squares
Dominoes Dominoes
ETL ETL
Flatten Array Flatten Array
Food Chain Food Chain
Forth Forth
Gigasecond Gigasecond
Go Counting Go Counting
Grade School Grade School
Grains Grains
Grep Grep
Hamming Hamming
Hangman Hangman
High Scores High Scores
House House
ISBN Verifier ISBN Verifier
Isogram Isogram
Killer Sudoku Helper Killer Sudoku Helper
Kindergarten Garden Kindergarten Garden
Knapsack Knapsack
Largest Series Product Largest Series Product
Leap Leap
Ledger Ledger
Lens Person Lens Person
Linked List Linked List
List Ops List Ops
Luhn Luhn
Markdown Markdown
Matching Brackets Matching Brackets
Matrix Matrix
Meetup Meetup
Micro Blog Micro Blog
Minesweeper Minesweeper
Nth Prime Nth Prime
Nucleotide Count Nucleotide Count
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
Pig Latin Pig Latin
Poker Poker
Prime Factors Prime Factors
Protein Translation Protein Translation
Proverb Proverb
Pythagorean Triplet Pythagorean Triplet
Queen Attack Queen Attack
REST API REST API
RNA Transcription RNA Transcription
Rail Fence Cipher Rail Fence Cipher
Raindrops Raindrops
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
Robot Name Robot Name
Robot Simulator Robot Simulator
Roman Numerals Roman Numerals
Rotational Cipher Rotational Cipher
Run-Length Encoding Run-Length Encoding
SGF Parsing SGF Parsing
Saddle Points Saddle Points
Satellite Satellite
Say Say
Scale Generator Scale Generator
Scrabble Score Scrabble Score
Secret Handshake Secret Handshake
Series Series
Sieve Sieve
Simple Cipher Simple Cipher
Simple Linked List Simple Linked List
Space Age Space Age
Spiral Matrix Spiral Matrix
Square Root Square Root
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
Triangle Triangle
Twelve Days Twelve Days
Two Bucket Two Bucket
Two-Fer Two-Fer
Variable Length Quantity Variable Length Quantity
Word Count Word Count
Word Search Word Search
Wordy Wordy
Yacht Yacht
Zebra Puzzle Zebra Puzzle
Zipper Zipper