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authorNickPapanastasiou <nickpap9411@gmail.com>2015-06-16 17:10:57 -0400
committerNickPapanastasiou <nickpap9411@gmail.com>2015-06-16 17:10:57 -0400
commit8bb2c3db63b87582764dca2641c8d84b39ed017f (patch)
tree7ab86f7398ef67575f490bab036f9da8cb850fe0 /d.html.markdown
parentf30876d3f659d2c28ebe97bd4416d4dd514e5d22 (diff)
UFCS corrections; shorter intro
Diffstat (limited to 'd.html.markdown')
-rw-r--r--d.html.markdown53
1 files changed, 22 insertions, 31 deletions
diff --git a/d.html.markdown b/d.html.markdown
index 36153500..f0e9ce02 100644
--- a/d.html.markdown
+++ b/d.html.markdown
@@ -6,17 +6,6 @@ contributors:
lang: en
---
-If you're like me and spend way too much time on the internet, odds are you've heard
-about [D](http://dlang.org/). The D programming language is a modern, general-purpose,
-multi-paradigm language with fantastic support for OOP, functional programming, metaprogramming,
-and easy concurrency and parallelism, and runs the gamut from low-level features such as
-memory management, inline assembly, and pointer arithmetic, to high-level constructs
-such as higher-order functions and generic structures and functions via templates, all with
-a pleasant syntax, and blazing fast performance!
-
-D is actively developed by Walter Bright and Andrei Alexandrescu, two super smart, really cool
-dudes. With all that out of the way, let's look at some examples!
-
```d
// You know what's coming...
module hello;
@@ -28,16 +17,27 @@ void main(string[] args) {
writeln("Hello, World!");
}
-// Conditionals and loops work as expected.
+If you're like me and spend way too much time on the internet, odds are you've heard
+about [D](http://dlang.org/). The D programming language is a modern, general-purpose,
+multi-paradigm language with support for everything from low-level features to
+expressive high-level abstractions.
+
+D is actively developed by Walter Bright and Andrei Alexandrescu, two super smart, really cool
+dudes. With all that out of the way, let's look at some examples!
+
+
import std.stdio;
void main() {
- for(int i = 0; i < 5; i++) {
+
+ // Conditionals and loops work as expected.
+ for(int i = 0; i < 10000; i++) {
writeln(i);
}
auto n = 1; // use auto for type inferred variables
-
+
+ // Numeric literals can use _ as a digit seperator for clarity
while(n < 10_000) {
n += n;
}
@@ -48,7 +48,7 @@ void main() {
// For and while are nice, but in D-land we prefer foreach
// The .. creates a continuous range, excluding the end
- foreach(i; 1..1000000) {
+ foreach(i; 1..1_000_000) {
if(n % 2 == 0)
writeln(i);
}
@@ -122,7 +122,7 @@ class Matrix(uint m, uint n, T = int) {
T[n] columns;
}
-auto mat = new Matrix!(3, 3); // We've defaulted T to int
+auto mat = new Matrix!(3, 3); // We've defaulted type T to int
```
@@ -176,19 +176,20 @@ void main() {
mc.data = 7;
mc.other = "seven";
-
+
writeln(mc.data);
writeln(mc.other);
}
```
-With properties, we can add any amount of validation to
+With properties, we can add any amount of logic to
our getter and setter methods, and keep the clean syntax of
accessing members directly!
Other object-oriented goodies at our disposal
include `interface`s, `abstract class`es,
-and `override`ing methods.
+and `override`ing methods. D does inheritance just like Java:
+Extend one class, implement as many interfaces as you please.
We've seen D's OOP facilities, but let's switch gears. D offers
functional programming with first-class functions, `pure`
@@ -217,17 +218,7 @@ void main() {
Notice how we got to build a nice Haskellian pipeline to compute num?
That's thanks to a D innovation know as Uniform Function Call Syntax.
With UFCS, we can choose whether to write a function call as a method
-or free function all. In general, if we have a function
+or free function call! Walter wrote a nice article on this [http://www.drdobbs.com/cpp/uniform-function-call-syntax/232700394](here.) In short, you can call functions whose first parameter
+is of some type A on any expression of type A as a methods.
-```d
-f(A, B, C, ...)
-```
-
-Then we may write
-
-```d
-A.f(B, C, ...)
-```
-and the two are equivalent! No more fiddling to remember if it's
-str.length or length(str)!