Re^2: uninitialized $_ sneaks past warnings in grep/map block or expression

If it is being given a value by a for loop, a while loop with a readline operator, given, grep, or map, then it is defined.

Not if the value given isn't defined.

$ perl -wE 'say for 1, undef, 3'
1
Use of uninitialized value in say at -e line 1.

3
[download]

Comment on Re^2: uninitialized $_ sneaks past warnings in grep/map block or expression Download Code

Replies are listed 'Best First'.
Re^3: uninitialized $_ sneaks past warnings in grep/map block or expression by mr_mischief (Monsignor) on Sep 01, 2010 at 16:05 UTC
That's a trick. You've very specifically given it a non-value. ;-)	[reply]