Operator outta

[domasz]

So we have operator in. We can use it like:

Code: Pascal  [Select][+][-]

1. if 5 in [1,3,5]

Then we should have outta, like:

Code: Pascal  [Select][+][-]

1. if 5 outta [1,3,4]

Much cleaner than

Code: Pascal  [Select][+][-]

1. if not (5 in [1,3,4])

[440bx]

if something like that were to be considered, I'd much prefer something along the lines of:

Code: Pascal  [Select][+][-]

1. if 5 notin [1, 3, 4] then { whatever } ;
2.  

[domasz]

That's even better. We need this feature now! It's impossible to write any program in FP without this feature!!11

[BildatBoffin]

Why not just the not-in combo

Code: Pascal  [Select][+][-]

1. if 5 not in [1,3,4]

[Kays]

If

Code: Pascal  [Select][+][-]

1. if not

bothers you, you may want to program in Ruby or other languages that have the keyword

Code: Ruby  [Select][+][-]

1. unless

There is of course the option to rephrase an expression:

Code: Pascal  [Select][+][-]

1. if [5] * [1, 2, 3] = [] then

[domasz]

"not in" might be harder to introduce than "notin" since "not" already is used for something else.
For me "unless" is kinda weird.

Code: Pascal  [Select][+][-]

1. if [5] * [1, 2, 3] = [] then

That's too mathy

[wp]

What's wrong with

Code: Pascal  [Select][+][-]

1.  if not (5 in [1, 2, 3])

? Having to type two backets? Come on...

[domasz]

Brackets make things harder to read. In this example it's easy:

Code: Pascal  [Select][+][-]

1. if not (5 in [1, 2, 3])

but it can be more complicated:

Code: Pascal  [Select][+][-]

1. if ((not (5 in [1,2,3]) or (6 > 5) or (7 = fun(8))) and (1 = 2)

With operator "notin" and a few others we could simplify a lot or expressions.

[Khrys]

If you really, really want to do this...

Code: Pascal  [Select][+][-]

1. {$macro on}
2. {$define outta := xor}
3.  
4. type
5.   TByteSet = set of Byte;
6.  
7. operator xor(A: Integer; B: TByteSet): Boolean; inline;
8. begin
9.   Result := not (A in B);
10. end;
11.  
12. function Test(): Boolean;
13. begin
14.   Result := 5 outta [1, 3, 4];
15. end;

[domasz]

Thanks, Khrys. That's very nice!