2017-08-15

d/hello-world/README.md

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+# Hello World
+
+The classical introductory exercise. Just say "Hello, World!".
+
+["Hello, World!"](http://en.wikipedia.org/wiki/%22Hello,_world!%22_program) is
+the traditional first program for beginning programming in a new language
+or environment.
+
+The objectives are simple:
+
+- Write a function that returns the string "Hello, World!".
+- Run the test suite and make sure that it succeeds.
+- Submit your solution and check it at the website.
+
+If everything goes well, you will be ready to fetch your first real exercise.
+
+## Getting Started
+
+Make sure you have read [D page](http://exercism.io/languages/dlang) on
+exercism.io.  This covers the basic information on setting up the development
+environment expected by the exercises.
+
+## Passing the Tests
+
+Get the first test compiling, linking and passing by following the [three
+rules of test-driven development](http://butunclebob.com/ArticleS.UncleBob.TheThreeRulesOfTdd).
+Create just enough structure by declaring namespaces, functions, classes,
+etc., to satisfy any compiler errors and get the test to fail.  Then write
+just enough code to get the test to pass.  Once you've done that,
+uncomment the next test by moving the following line past the next test.
+
+```D
+static if (all_tests_enabled)
+```
+
+This may result in compile errors as new constructs may be invoked that
+you haven't yet declared or defined.  Again, fix the compile errors minimally
+to get a failing test, then change the code minimally to pass the test,
+refactor your implementation for readability and expressiveness and then
+go on to the next test.
+
+Try to use standard D facilities in preference to writing your own
+low-level algorithms or facilities by hand.  [DRefLanguage](https://dlang.org/spec/spec.html)
+and [DReference](https://dlang.org/phobos/index.html) are references to the D language and D standard library.
+
+
+## Source
+
+This is an exercise to introduce users to using Exercism [http://en.wikipedia.org/wiki/%22Hello,_world!%22_program](http://en.wikipedia.org/wiki/%22Hello,_world!%22_program)
+
+## Submitting Incomplete Solutions
+It's possible to submit an incomplete solution so you can see how others have completed the exercise.

d/hello-world/dub.sdl

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+name "hello-world"
+buildRequirements "disallowDeprecations"

d/hello-world/source/hello_world.d

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+module helloworld_test;
+
+unittest {
+const int allTestsEnabled = 0;
+
+    assert(hello() == "Hello, World!");
+static if (allTestsEnabled) {
+    assert(hello("Alice") == "Hello, Alice!");
+    assert(hello("Bob") == "Hello, Bob!");
+    assert(hello("") == "Hello, !");
+}
+
+}