Ballerina

1,065 students

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Exercises

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26 contributors

57 mentors

1,065
students have developed their Ballerina skills on Exercism.

Students

1,065

Submissions

5,057

Mentoring Discussions

The Ballerina track needs attention ⚠️

Building

Build

Use your knowledge to build the Ballerina track itself

26 contributors

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

4,859

Test Run Pass Rate

35.2% (1708)

Test Run Fail Rate

54.1% (2627)

Test Run Error Rate

10.8% (524)

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 50 practice exercises. Find out more.

Usage statistics

42 active practice exercises

Started

Attempts

Completions

Mentoring requests

Hello World

521

724 (avg. 1.4)

364 (69.9%)

0 (0.0%)

Calculator Service

231

1,003 (avg. 4.3)

133 (57.6%)

8 (3.5%)

Echo Service

155

318 (avg. 2.1)

129 (83.2%)

4 (2.6%)

Service Error Handling

113

613 (avg. 5.4)

95 (84.1%)

1 (0.9%)

Greeting Service

151

446 (avg. 3.0)

131 (86.8%)

7 (4.6%)

Hello World Service

178

273 (avg. 1.5)

142 (79.8%)

15 (8.4%)

Service Composition

192 (avg. 2.7)

53 (74.6%)

0 (0.0%)

Service Invocation

15 (avg. 1.3)

7 (58.3%)

5 (41.7%)

CSV Fuel Allowance

77 (avg. 1.6)

41 (83.7%)

0 (0.0%)

JSON Fuel Allowance

87 (avg. 1.6)

43 (79.6%)

1 (1.9%)

XML Fuel Allowance

118 (avg. 3.6)

9 (27.3%)

0 (0.0%)

Monitor Rush

61 (avg. 1.6)

36 (94.7%)

0 (0.0%)

The Cake is a Lie

10 (avg. 1.4)

2 (28.6%)

0 (0.0%)

PaySwitch - Salary Converter

2 (avg. 1.0)

1 (50.0%)

0 (0.0%)

Isogram

103 (avg. 2.7)

33 (86.8%)

0 (0.0%)

Raindrops

69 (avg. 2.2)

28 (90.3%)

1 (3.2%)

Roman Numerals

142 (avg. 4.3)

29 (87.9%)

1 (3.0%)

Space Age

105 (avg. 3.6)

28 (96.6%)

0 (0.0%)

Acronym

162 (avg. 3.7)

34 (77.3%)

1 (2.3%)

Sieve

7 (avg. 1.0)

5 (71.4%)

0 (0.0%)

Bob

12 (avg. 1.7)

4 (57.1%)

0 (0.0%)

Collatz Conjecture

33 (avg. 4.1)

5 (62.5%)

0 (0.0%)

Grains

27 (avg. 3.4)

6 (75.0%)

0 (0.0%)

Knapsack

3 (avg. 0.8)

2 (50.0%)

0 (0.0%)

Hamming

8 (avg. 1.1)

4 (57.1%)

0 (0.0%)

Difference Of Squares

18 (avg. 1.6)

10 (90.9%)

0 (0.0%)

Leap

18 (avg. 1.5)

11 (91.7%)

0 (0.0%)

Darts

13 (avg. 1.6)

7 (87.5%)

0 (0.0%)

Two Fer

28 (avg. 3.1)

7 (77.8%)

0 (0.0%)

Pangram

34 (avg. 3.8)

7 (77.8%)

0 (0.0%)

Anagram

11 (avg. 2.2)

3 (60.0%)

1 (20.0%)

Protein Translation

6 (avg. 1.0)

3 (50.0%)

1 (16.7%)

ETL

10 (avg. 1.7)

4 (66.7%)

1 (16.7%)

Two Bucket

4 (avg. 1.3)

2 (66.7%)

1 (33.3%)

Binary Search

12 (avg. 1.7)

6 (85.7%)

0 (0.0%)

Linked List

3 (avg. 0.6)

2 (40.0%)

0 (0.0%)

Largest Series Product

11 (avg. 2.8)

4 (100.0%)

0 (0.0%)

Robot Simulator

2 (avg. 0.7)

2 (66.7%)

0 (0.0%)

Saddle Points

4 (avg. 1.0)

2 (50.0%)

1 (25.0%)

Sum Of Multiples

14 (avg. 2.8)

4 (80.0%)

0 (0.0%)

Secret Handshake

4 (avg. 1.0)

2 (50.0%)

0 (0.0%)

Yacht

31 (avg. 7.8)

2 (50.0%)

0 (0.0%)

2 deprecated practice exercises

Started

Attempts

Completions

Mentoring requests

Legacy Service Client

6 (avg. 1.2)

4 (80.0%)

2 (40.0%)

Order Management

1 (avg. 1.0)

1 (100.0%)

0 (0.0%)

98 unimplemented practice exercises

Affine Cipher

All Your Base

Allergies

Alphametics

Armstrong Numbers

Atbash Cipher

Bank Account

Binary Search Tree

Book Store

Bottle Song

Bowling

Change

Circular Buffer

Clock

Complex Numbers

Connect

Crypto Square

Custom Set

D&D Character

DOT DSL

Diamond

Dominoes

Flatten Array

Food Chain

Forth

Gigasecond

Go Counting

Grade School

Grep

Hangman

High Scores

House

ISBN Verifier

Killer Sudoku Helper

Kindergarten Garden

Ledger

Lens Person

List Ops

Luhn

Markdown

Matching Brackets

Matrix

Meetup

Micro Blog

Minesweeper

Nth Prime

Nucleotide Count

OCR Numbers

POV

PaaS I/O

Palindrome Products

Parallel Letter Frequency

Pascal's Triangle

Perfect Numbers

Phone Number

Pig Latin

Poker

Prime Factors

Proverb

Pythagorean Triplet

Queen Attack

REST API

RNA Transcription

Rail Fence Cipher

Rational Numbers

React

Rectangles

Resistor Color

Resistor Color Duo

Resistor Color Trio

Reverse String

Robot Name

Rotational Cipher

Run-Length Encoding

SGF Parsing

Satellite

Say

Scale Generator

Scrabble Score

Series

Simple Cipher

Simple Linked List

Spiral Matrix

Square Root

State of Tic-Tac-Toe

Strain

Sublist

Tournament

Transpose

Tree Building

Triangle

Twelve Days

Variable Length Quantity

Word Count

Word Search

Wordy

Zebra Puzzle

Zipper

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902

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721

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1,065 students have developed their Ballerina skills on Exercism.

The Ballerina track needs attention ⚠️

Build

Build Test Runners

Usage statistics

Build Analyzers

Build Representers

Create Practice Exercises

Usage statistics

We 💙 our volunteers

1,065
students have developed their Ballerina skills on Exercism.