721
students have developed their D skills on Exercism.

Students
721
Submissions
4,409
Mentoring Discussions
71

The D track needs attention ⚠️

Building

Build

Use your knowledge to build the D 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. D is currently utilising a Version 1 Test Runner. Find out more.

Usage statistics

Total Test Runner Runs
3,761
Test Run Pass Rate
43.4% (1634)
Test Run Fail Rate
37.6% (1416)
Test Run Error Rate
18.9% (711)

Build Analyzers

Learn More

Build an Analyzer for D: 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 40 practice exercises. Find out more.

Usage statistics

34 active practice exercises
Started
Attempts
Completions
Mentoring requests
Hello World Hello World
442
552 (avg. 1.2)
359 (81.2%)
0 (0.0%)
Armstrong Numbers Armstrong Numbers
133
455 (avg. 3.4)
65 (48.9%)
6 (4.5%)
Collatz Conjecture Collatz Conjecture
79
350 (avg. 4.4)
60 (75.9%)
2 (2.5%)
Darts Darts
53
160 (avg. 3.0)
44 (83.0%)
1 (1.9%)
Gigasecond Gigasecond
128
173 (avg. 1.4)
108 (84.4%)
7 (5.5%)
Isogram Isogram
38
122 (avg. 3.2)
30 (78.9%)
2 (5.3%)
Leap Leap
168
235 (avg. 1.4)
127 (75.6%)
16 (9.5%)
Luhn Luhn
29
201 (avg. 6.9)
22 (75.9%)
1 (3.4%)
Matching Brackets Matching Brackets
29
71 (avg. 2.4)
20 (69.0%)
2 (6.9%)
Nth Prime Nth Prime
25
75 (avg. 3.0)
18 (72.0%)
0 (0.0%)
Pangram Pangram
45
131 (avg. 2.9)
38 (84.4%)
3 (6.7%)
Prime Factors Prime Factors
25
54 (avg. 2.2)
18 (72.0%)
1 (4.0%)
Raindrops Raindrops
75
113 (avg. 1.5)
65 (86.7%)
2 (2.7%)
Resistor Color Duo Resistor Color Duo
20
42 (avg. 2.1)
16 (80.0%)
1 (5.0%)
Sum of Multiples Sum of Multiples
23
107 (avg. 4.7)
17 (73.9%)
0 (0.0%)
Two Fer Two Fer
33
80 (avg. 2.4)
29 (87.9%)
1 (3.0%)
Bob Bob
62
136 (avg. 2.2)
48 (77.4%)
2 (3.2%)
Difference of Squares Difference of Squares
44
99 (avg. 2.3)
36 (81.8%)
3 (6.8%)
ETL ETL
49
64 (avg. 1.3)
41 (83.7%)
3 (6.1%)
Hamming Hamming
52
86 (avg. 1.7)
41 (78.8%)
1 (1.9%)
Resistor Color Resistor Color
26
64 (avg. 2.5)
19 (73.1%)
0 (0.0%)
Reverse String Reverse String
30
87 (avg. 2.9)
24 (80.0%)
1 (3.3%)
RNA Transcription RNA Transcription
85
138 (avg. 1.6)
73 (85.9%)
4 (4.7%)
Triangle Triangle
36
65 (avg. 1.8)
30 (83.3%)
2 (5.6%)
Crypto Square Crypto Square
26
53 (avg. 2.0)
16 (61.5%)
1 (3.8%)
Nucleotide Count Nucleotide Count
45
88 (avg. 2.0)
34 (75.6%)
3 (6.7%)
Perfect Numbers Perfect Numbers
23
133 (avg. 5.8)
18 (78.3%)
1 (4.3%)
Robot Name Robot Name
43
66 (avg. 1.5)
33 (76.7%)
2 (4.7%)
Roman Numerals Roman Numerals
41
78 (avg. 1.9)
31 (75.6%)
2 (4.9%)
Series Series
38
90 (avg. 2.4)
28 (73.7%)
1 (2.6%)
Circular Buffer Circular Buffer
31
41 (avg. 1.3)
18 (58.1%)
1 (3.2%)
Grains Grains
26
134 (avg. 5.2)
19 (73.1%)
0 (0.0%)
Run-Length Encoding Run-Length Encoding
16
25 (avg. 1.6)
10 (62.5%)
0 (0.0%)
React React
32
41 (avg. 1.3)
7 (21.9%)
0 (0.0%)
94 unimplemented practice exercises
Acronym Acronym
Affine Cipher Affine Cipher
All Your Base All Your Base
Allergies Allergies
Alphametics Alphametics
Anagram Anagram
Atbash Cipher Atbash Cipher
Bank Account Bank Account
Binary Search Binary Search
Binary Search Tree Binary Search Tree
Book Store Book Store
Bottle Song Bottle Song
Bowling Bowling
Change Change
Clock Clock
Complex Numbers Complex Numbers
Connect Connect
Custom Set Custom Set
D&D Character D&D Character
DOT DSL DOT DSL
Diamond Diamond
Dominoes Dominoes
Error Handling Error Handling
Flatten Array Flatten Array
Food Chain Food Chain
Forth Forth
Go Counting Go Counting
Grade School Grade School
Grep Grep
Hangman Hangman
High Scores High Scores
House House
ISBN Verifier ISBN Verifier
Killer Sudoku Helper Killer Sudoku Helper
Kindergarten Garden Kindergarten Garden
Knapsack Knapsack
Largest Series Product Largest Series Product
Ledger Ledger
Lens Person Lens Person
Linked List Linked List
List Ops List Ops
Markdown Markdown
Matrix Matrix
Meetup Meetup
Micro Blog Micro Blog
Minesweeper Minesweeper
OCR Numbers OCR Numbers
POV POV
PaaS I/O PaaS I/O
Palindrome Products Palindrome Products
Parallel Letter Frequency Parallel Letter Frequency
Pascal's Triangle Pascal's Triangle
Phone Number Phone Number
Pig Latin Pig Latin
Poker Poker
Protein Translation Protein Translation
Proverb Proverb
Pythagorean Triplet Pythagorean Triplet
Queen Attack Queen Attack
REST API REST API
Rail Fence Cipher Rail Fence Cipher
Rational Numbers Rational Numbers
Rectangles Rectangles
Resistor Color Trio Resistor Color Trio
Robot Simulator Robot Simulator
Rotational Cipher Rotational Cipher
SGF Parsing SGF Parsing
Saddle Points Saddle Points
Satellite Satellite
Say Say
Scale Generator Scale Generator
Scrabble Score Scrabble Score
Secret Handshake Secret Handshake
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
Tournament Tournament
Transpose Transpose
Tree Building Tree Building
Twelve Days Twelve Days
Two Bucket Two Bucket
Variable Length Quantity Variable Length Quantity
Word Count Word Count
Word Search Word Search
Wordy Wordy
Yacht Yacht
Zebra Puzzle Zebra Puzzle
Zipper Zipper