Syntax for checking if an element exists in a list

[Nicholas Wilson via Digitalmars-d-learn]

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.

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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)