Re^3: How to create loop in perl dynamically

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Re^4: How to create loop in perl dynamically by johngg (Canon) on Sep 26, 2012 at 14:31 UTC
By default the loop variable is held in `$_` but you can assign to a variable if you wish. It is not a good idea to alter loop variables inside the loop, that leads to all sorts of grief. `$ perl -Mstrict -Mwarnings -E ' > foreach my $outer ( 1 .. 3 ) > { > foreach my $inner ( 7 .. 9 ) > { > say qq{$outer x $inner = @{ [ $outer * $inner ] }}; > } > }' 1 x 7 = 7 1 x 8 = 8 1 x 9 = 9 2 x 7 = 14 2 x 8 = 16 2 x 9 = 18 3 x 7 = 21 3 x 8 = 24 3 x 9 = 27 $` [download] I hope this is helpful. Cheers, JohnGG	[reply] [d/l] [select]
Re^4: How to create loop in perl dynamically by locked_user sundialsvc4 (Abbot) on Sep 26, 2012 at 15:52 UTC
`foreach my $foo (1 .. $x)` ... creates a local variable named `$foo` which contains the current index for this particular loop. Never use `$_` for this purpose, usually.