Need help with basic functional programming

[bearophile via Digitalmars-d-learn]

Eric:

>     while (!buf.empty())
>     {
>         p++;
>         buf.popFront();

Those () can be omitted, if you mind the noise (but you can also 
keep them).


>         if (buf.front() <= '0' || buf.front() >= '9') break;

std.ascii.isDigit helps.


>     curTok.image = cast(string) cbuffer[0 .. (p - 
> cbuffer.ptr)].dup;

If you want a string, then idup is better. Try to minimize the 
number of casts in your code.


>     auto s = buf.until("a <= '0' || a >= '9'");

Perhaps you need a ! after the until, or a !q{a <= '0' || a >= 
'9'}.


> Also, what is the fastest way to convert a range to a string?

The "text" function is the simplest.

Bye,
bearophile