On 20/11/11 1:09 PM, Robert Clipsham wrote:
- The code sample at the top is terrible, the equivalent C is only a
couple of lines longer and it doesn't show off any of what makes D
better! Admittedly you're limited in what you can do here as the code
needs to be fairly understandable by non-D programmers, but what's there
is... Not good at all.
It's hard to come up with something that is short, easily-understandable
and demonstrates D's (numerous) powerful features.
How about this one:
// Match email addresses on each line of standard input
// using a compile-time generated regular expression engine.
import std.stdio, std.regex;
void main() {
string email = r"\b[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,4}\b";
foreach (line; stdin.byLine()) {
foreach (m; match(line, regex(email, "i"))) {
writefln("%s[%s]%s", m.pre, m.hit, m.post);
}
}
}
Demonstrates:
- Syntax
- Imports
- Raw string literals
- Foreach with type deduction
- CTFE with regex
- "Batteries included" library (std.byLine(), regex, match, writefln)
- General succinctness of D code
- Rotating the example is a brilliant idea, particularly if powered by a
continuous contest.
- This is less about the message, but how about an "explain this" link
in the corner of examples with little hints for C/C++/Java programmers,
so when clicked additional comments appear in the code or bubbles appear
above on hover or something, they would include small bits of text like
"auto can be used in place of a type to infer the type from what is
being assigned"... But better worded of course.
- Maybe it's just me, but I don't like the title being so long. I think
"The D Programming Language" on its own is fine. The rest of it may
still have a place, but it needs to be elsewhere in my opinion (even if
it just moves to the line below).
- Your summary sentence at the start reads "It pragmatically combines
efficiency, control, and modeling power, with safety and programmer
productivity." You then go on to talk about convinience, power and
efficiency... http://en.wikipedia.org/wiki/Topic_sentence The sentence
needs to be changed to reflect what you go on to detail below -
currently you're making statements without backing them up (note that
you do back up most of it, not all of it though, and the subheadings
don't make it obvious where you can find out more about the claims).
- convinience -> convenience
- I can't really fault the bullet points, they're a huge improvement.
- I have a reasonably large screen and can't see the news section
without scrolling. To me this means there is no news ;)
I'm starting to nit-pick, it must be getting better.
+1 to everything
