Disadvantage is that delete works good on hashes, but "bad" (and deprecated) on arrays. It does not really delete an entry but just undefs it (with the exception when it is the last element(s), so it worked in the original example, but if you put e.g. to 'a'-ids at the start of the array, you'll see it). See also the Documention of delete.

Greetings,
Janek Schleicher

PS: I agree that the grep solution is the usual way. Was just interested to write an inplace algorithm, as sometimes that's usefull, too, when working with big data.

In reply to Re^2: removing duplicates from an array of hashes by bigj
in thread removing duplicates from an array of hashes by Anonymous Monk

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