Oh, I see, sorry.

Actually, both jdporter and I got it wrong.
You don't modify $_ like jdporter thought.
You don't modify %_ like I thought.

Wow, that piece of code is so incredibly bad! You modify some random variable based on the current contents of $_. Whether it'll work or not is random. Most of the time, it won't. 

for (
   [qw(a a b c)],
   [qw(d e e f)],
) {
   print(uinq(@$_), "\n");    # Can't coerce array into hash
}

[download]
for ('a a b c', 'd e e f') {
   print(uinq(split), "\n");  # Can't use string ("a a b c") as a HASH
+ ref while "strict refs" in use
}

[download]

Adding local $_; causes the a specific variable to be used. That alieviates some of the problem, but that variable needs to be localized too. Why not just use %_?

As an expression: 

do { local %_; @_{@_}=(); keys %_ }

[download]

As a sub: 

sub uinq { local %_; @_{@_}=(); keys %_ }

[download]

In reply to Re^8: Remove redundency from an array by ikegami
in thread Remove redundency from an array by vc_will_do

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