mutable default parameter problem [Prothon]
Christopher T King
squirrel at WPI.EDU
Fri Jun 25 22:35:30 CEST 2004
Dave Brueck wrote:
> Seems like a waste to reserve a
> symbol for something so rarely needed.
Lisp and Scheme do the same thing:
(set! a 5) <- sets a variable (i.e. changes its value)
(eq? a 6) <- tests equality (returns true or false)
It's defined precisely because it's not needed often (at least in the !
case): the functions that modify their arguments are few and far between,
so it is best to warn the programmer of this behaviour.
Though ? doesn't have such a pressing case as !, it does make code easier
to read (distinguishing functions that do something from those that make
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