Iteration: Aliasing and Scoping
Learn about the aliasing and scoping of the iterator variable.
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Iteration and aliasing
The for loop aliases the iterator variable to the values in the iteration, such that any modifications to the value of the iterator modify the value in place:
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use Test::More;my @nums = 1 .. 10;$_ **= 2 for @nums;is $nums[0], 1, '1 * 1 is 1';is $nums[1], 4, '2 * 2 is 4';#...is $nums[9], 100, '10 * 10 is 100';done_testing()
This aliasing also works with the block-style for loop:
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use Test::More;my @nums = 1 .. 10;for my $num (@nums) {$num **= 2;}is $nums[0], 1, '1 * 1 is 1';is $nums[1], 4, '2 * 2 is 4';# ...is $nums[9], 100, '10 * 10 is 100';done_testing()
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