[FR] expr ternary operator support

    Apr 01 2021 | 2:20 pm
    Hi, It would be great if expr/vexpr could support the ternary operator. Is that something that you could consider adding? so that we could write things like that : expr ($f1 < 1) ? $f2 : $f3

    • Apr 01 2021 | 5:17 pm
      Here are some ways to do ternary operations with jstrigger and gen (no tilde):
    • Apr 01 2021 | 6:27 pm
      sure there are workarounds, but it's missing in expr and it would be really handy to have it there.
    • Apr 01 2021 | 10:34 pm
      in theory it is dangerous to use arithmetics for bools from float input, but i believe really only in theory. expr (($f1 < 1) ? $f2 : $f3 ) --> expr (($f1 < 1)*$f2 + ($f1 >= 1)*$f3)
      and yes it is longer and not as good to read. whereever you dont need to combine it with more stuff, you could make yourself an abstraction with regexp where you transform your (($f1 < 1) ? $f2 : $f3 ) into the above form by scripting an expr. unneccessary to add that you could also transform it into [if ($f1 < 1) then $f2 else $f3], or, in the concrete case, use split & 2 trigger. which is actually a good idea, which i will maybe steal right now. the elvis operator has left the patch. -110
    • Apr 01 2021 | 10:41 pm
      expr (($f1 < 1)*$f2 + ($f1 >= 1)*$f3)
      yes, I know about it too: I've used that trick many many times in the past, and that's because I was using it today again that I decided to request the ternary operator! :) again; I know there are alternatives (note that it applies to all expr's operators really!) but it really seems to me that the ternary operator should be supported by expr and vexpr.
    • Apr 01 2021 | 10:54 pm
      when i think about it, scripting the content of the patch is only required when you want to have true int type output when all input numbers are ints. and regexp is only needed when you want to include a syntax check. otherwise you could - for the usual conditional statement - just write something like [110.ternary input>3?5:7] or, even simpler, [iif 3 5 7] and parse the arguments.