Fabulous ! Operator

Fabulous ! Operator

!  Fabulous ! Operator  (Also called Fabulous Operator) 

! Operator can have multiple meanings, when used as a suffix. of course, as a prefix, ! represents NOT as in most C like languages.

! can be used to (1) Compute factorial of numbers (including complex numbers etc), (2) Create functions out of strings, (3) Create predicate functions and search functions out of simple notations with regular expressions, strings, etc.