Yes, there's a lot of different ways of writing loops.

Note that your code can be simplified to 

my %y; $y{shift(@x)} = 1 while @x;

[download]
or the non-destructive 
my %y = map { $_ => 1 } @x;

[download]

In reply to Re^3: use array for hash-keys without loop by ikegami
in thread use array for hash-keys without loop by piccard

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