Idiomatic D?

[bearophile]

Matt Diesel:

> Firstly, is there any good resource on what idiomatic D usage 
> is? For instance Go has a huge page called Effective Go which 
> tells you how you should use features, rather than what they 
> are.

I don't know any such page, but it looks like an interesting 
addition for the online docs.


> And secondly, I would be grateful if anyone could take a look 
> at this very simple program and comment on how I'm using the 
> language (ignoring the fact it's really simple and the lexer is 
> rubbish). Just stuff like interface, class and variable naming 
> and program structure.

Some notes:
- In D method names start with a lowercase.
- For multi-line ddoc comments there is also /** ... */
- Consider the usage of some structs, where appropriate. Structs 
are much more used in D compared to C#.
- Consider adding pure/nothrow/const/in/mmutable (and even @safe 
if you want) tags to methods, functions, arguments, and even 
normal variables, where possible.
- this.input.length == 0  is better written this.input.empty, 
where empty for arrays (and strings) is in std.array.
- Consider the usage of lambdas, to replace function int(int 
left, int right) { return left + right; } with (left, right) => 
left + right;.
- Instead of free assert() consider using preconditions, 
postconditions and class/struct invariants.
- I suggest to add some unittest{} blocks.
- Instead of using Exception() consider creating one exception 
class for your code, or use one of the few standard ones... But I 
don't know how many standard ones there are in Phobos.
- Overall you code looks well formatted, well commented, well 
written (I have not run it), it's a good start.

Bye,
bearophile