D - Programming language

D is a programming language created in 2001 by Walter Bright and Andrei Alexandrescu.

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The D programming language is an object-oriented, imperative, multi-paradigm system programming language created by Walter Bright of Digital Mars and released in 2001. Bright was joined in the design and development effort in 2007 by Andrei Alexandrescu. Though it originated as a re-engineering of C++, D is a distinct language, having redesigned some core C++ features while also taking inspiration from other languages, notably Java, Python, Ruby, C#, and Eiffel. Read more on Wikipedia...

Tags: programming language
There are at least 13,224 D repos on GitHub
Early development of D happened in Digital Mars
The Google BigQuery Public Dataset GitHub snapshot shows 6k users using D in 7k repos on GitHub
Check out the 7 D meetup groups on Meetup.com.
There are 243 Project Euler users using D
Explore D snippets on Rosetta Code
D is supported by the GDB
D on HOPL
D ranks #26 in the TIOBE Index
D Ubuntu package
D LSP implementation
CodeMirror package for syntax highlighting D
Pygments supports syntax highlighting for D
GitHub supports syntax highlighting for D
D appears in the Quine Relay project
Learn D on exercism.
There is a central package repository for D
dlang.org was registered in 2010
See also: (23 related languages) FreeBSD, Linux, C, C#, Eiffel, Java, Python, MiniD, Vala, Swift, Genie, Ruby, Assembly language, LLVM IR, CIL, Eclipse, Visual Studio, Emacs, Vim, TextMate, Visual Studio Code, GDB, UTF-8
27 PLDB concepts link to D: Alma, CIR, DRAKON, dub-pm, Encore, Erlang, Flow9, GCC, GHC, invokator, Iode, Java, Julia, mal, MongoDB, MonkeyX, Open Shading Language, Perl, PHP, Pony, PostgreSQL, Pygments, Python, Ruby, Rust, Swift, Volt

Example from Compiler Explorer:

// Type your code here, or load an example.
int square(int num) {
    return num * num;
}

Example from Riju:

import std.stdio;

void main()
{
    writeln("Hello, world!");
}

Example from the Hello World Collection:

// Hello World in D

import std.stdio;

void main()
{
   writefln("Hello World!");
}

Example from Linguist:

unittest
{
}

Example from Wikipedia:

1 import std.stdio, std.algorithm, std.range, std.string;
 2
 3 void main()
 4 {
 5     dstring[][dstring] signs2words;
 6
 7     foreach(dchar[] w; lines(File("words.txt")))
 8     {
 9         w = w.chomp().toLower();
10         immutable key = w.dup.sort().release().idup;
11         signs2words[key] ~= w.idup;
12     }
13
14     foreach(words; signs2words)
15         if(words.length > 1)
16             writefln(words.join(" "));
17 }

Language features

Feature	Supported	Example	Token
Binary Literals	✓	// 0[Bb][01_]+
Integers	✓	// (0\|[1-9][0-9_]*)([LUu]\|Lu\|LU\|uL\|UL)?
Floats	✓	// 0[xX]([0-9a-fA-F_]*\.[0-9a-fA-F_]+\|[0-9a-fA-F_]+)[pP][+\-]?[0-9_]+[fFL]?[i]?
Hexadecimals	✓	// 0[xX][0-9a-fA-F_]+
Octals	✓	// 0[0-7_]+
Strings	✓	"Hello world"	"
MultiLine Comments	✓	/+ A comment +/	/+ +/
Print() Debugging	✓		printf
Line Comments	✓	// A comment	//
Templates	✓	template TCopy(T) { void copy(out T to, T from) { to = from; } } int i; TCopy!(int).copy(i, 3);
Type Inference	✓
Operator Overloading	✓
Comments	✓
Pointers	✓
Case Insensitive Identifiers	X
Semantic Indentation	X