Re^2: undef a List of Variables

sub undeff { @_[0..-1] = (); };

-1 is the last index ... much easier to read. (And faster, too.)

Being right, does not endow the right to be rude; politeness costs nothing.
Being unknowing, is not the same as being stupid.
Expressing a contrary opinion, whether to the individual or the group, is more often a sign of deeper thought than of cantankerous belligerence.
Do not mistake your goals as the only goals; your opinion as the only opinion; your confidence as correctness. Saying you know better is not the same as explaining you know better.

Comment on Re^2: undef a List of Variables Download Code

Replies are listed 'Best First'.
Re^3: undef a List of Variables by ambrus (Abbot) on Jan 31, 2005 at 18:54 UTC
Yes, that works in most other languages. In ruby, `arr[0..-1]` returns all elements of the array (and is an lvalue too). In python, `arr[0:-1]` is all but the last element, `arr[0:]` or `arr[:]` is all elements. In octave, you don't have negative array indexes, but you have `avec(:)` for all of the vector, but also no special notation for all the elements starting the n'th (like `arr[n:]` in python). In mathematica, you have `arr[[All]]` for all elements of the array, but also no starting slice notation. (These are only a few languages of course.) Anyway, you can write `0..$#_` or even `0..@_` as the index, or avoid indexing completely and say `sub undeff { undef $_ for @_ }`.	[reply] [d/l] [select]
Re^3: undef a List of Variables by lidden (Curate) on Jan 31, 2005 at 18:01 UTC
But it does not work. 0..-1 is zero elements.	[reply]