Re: Syntax for checking if an element exists in a list

[Nicholas Wilson via Digitalmars-d-learn]

On Thursday, 5 February 2015 at 13:31:21 UTC, Nicholas Wilson 
wrote:
On Thursday, 5 February 2015 at 12:31:31 UTC, Stéphane wrote:
Syntax for checking if an element exists in a list
Hello,

  I would like to know if there is a better (easier to wite,
easier to read, easier to understand) way to check if an 
element
(string) is
in a list of strings.

  Here are the possibilities I see today, as someone who is new
to D:

1) using a switch

char [] myopt=get_an_option();

switch(myopt) {
case "opt1", "opt2", "opt3":
  do_A();
  break;
case "opt4":
  do_B();
  break;
default:
  do_C();
}

Note that D does NOT have default fall through. i.e.
 switch(myopt)
{
    case "opt1", "opt2", "opt3":
        do_A();
        break;
    case "opt4":
        do_B();
        break;
    default:
        do_C();
 }
is equivalent to
switch(myopt)
{
    case "opt1", "opt2", "opt3":
        do_A();
    case "opt4":
        do_B();
    default:
        do_C();
 }
to enable fall through use goto case; / goto case n;  to fall 
through once (to the next case) and to case n (where n is the 
case label identifier i.e. 5 or "foo"  or mylabel: )
switch(myopt)
{
    case "opt1", "opt2", "opt3":
        do_A();
        goto case;
    case "opt4":
        do_B();
    default:
        do_C();
 }

PPS: Where should I post, when I have such questions and 
problems
as the one in my previous paragraph? I did not find any "meta"
forum.

learn is the correct  place for such questions and in general 
for questions about how to do something or enquire as to why 
something is not working or not working the way you think it 
should.

Announcement is for announcements.
debuggers and ide are for debuggers and ide.

digitalmars.D is for discussion about the language the 
libraries and links to interesting stuff (for some value of 
stuff)

the D.gnu and D.ldc are for discussions/queries about gdc and 
ldc (the gcc and llvm backend compilers)

addendum
case n:
    ...
    break;
exists only for the ease of transliteration of C(++) where the 
break statement is required.
How ever
    break label;
is still useful and used in D. usually used to break from 
multiple in a single statement.