SPUG: Sorting hash question

[Damian Conway]

Peter Darley wrote:

> I would like to have it [a multi-level hash] sorted
> in the order of the keys of the %{$Item{Children}}.

The others who have suggested an array at the thrid level are right, but seeing
that you have a morbid fear of mixed data structures (;-) here's a way to iterate
through a hash, but in a sorted order:

	# walk through values of %hash in numeric order of its keys...

	for $next ( @hash{sort {$a<=>$b} keys %hash} ) {
		# do something with $next
	}

This uses a hash slice, slicing on the pre-sorted the keys of the hash.

In your case that becomes:

	for $SubItem (@{$Item{Children}}{sort {$a<=>$b} keys %{$Item{Children}}}) {
		# do something with $SubItem
	}

Frankly, you might want to reconsider the array-based solution ;-)

Damian

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