From: ruvim.pinka@gmail.com   
      
   On 2024-10-13 05:13, dxf wrote:   
   > On 13/10/2024 12:54 am, Ruvim wrote:   
   >> On 2024-10-12 05:45, dxf wrote:   
   >>> The basics:   
   >>>   
   >>> : .BAD ( -- )  cr ." Invalid item"  .abort ;   
   >>>   
   >>> : ZE? ( x -- )  if .bad then ;     \ abort if non-zero   
   >>> : NZ? ( x -- )  0= ze? ;           \ abort if zero   
   >>   
   >> Typically, if word name ends with a question mark, the first (top) output   
   parameter of the word is a *flag*. And it's true for all standard words.   
   (though, opposite is not true)   
   >   
   > It's rather similar.   
   >   
   > ZE? NZ?  destructively tests TOS   
      
   But these words do not return a flag in the first output parameter. So,   
   their names violate the common convention.   
      
      
   > ?ZE ?NZ  non-destructively tests TOS   
      
   These names follow the common convention. A question mark at the   
   beginning of a name means that the word does something or does nothing   
   depending on certain conditions.   
      
   Well known nonstandard words: `?stack` `?csp` `?comp` `?exec`   
   Standard words: `?do` `?dup`   
      
      
   >   
   > Only difference is test and action are rolled into the one function.   
   >   
      
      
   --   
   Ruvim   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)