3.1.4.1 what's the inverse of 'define variable ' and 'define method' ?
Bruce Hoult
what's the inverse of 'define variable ' and 'define method' ?
i.e.
? foo;
error: unbound variable: foo.
** Debugger **

Debug[1]> [interrupt -- returning to top level.]
? define variable foo = 99;
? foo;
==> 99
? WHATGOESHERE??
? foo;
error: unbound variable: foo.
** Debugger **
Seth LaForge
The point of define at the top level is that it creates a global binding. There are two things you can do to get the effect you want:
  • define the variable in it's own module (this prevents it from being visible elsewhere, unless you specifically export it; or
  • create a local binding using let. 
Here's an example of the latter:

? foo;
error: unbound variable: foo.
? begin
>   let foo = 99;
>   foo;
> end;
==> 99
? foo;
error: unbound variable: foo.
?
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