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How do I sort something alphabetically?

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Contributed by Anonymous Monk on Nov 06, 2000 at 06:15 UTC
Q&A  > sorting


Answer: How do I sort something alphabetically?
contributed by arturo

The default sort behavior with strings is "ASCIIbetical," rather than alphabetical. ASCII-wise, the capital letters (as a group) come before the lowercase (as a group); thus "D" comes before "a."

So assuming you want to sort a list of words, what you want is:

# make it a "sort sub" sub alphabetical { # compares lower-cased versions of the strings lc($a) cmp lc($b); } # to sort having defined this sub, you do @list = sort alphabetical @list;

Or, to avoid making a bunch of tiny little otherwise useless functions, sort also lets you use a block in place of a function:

@list = sort { lc($a) cmp lc($b) } @list

Answer: How do I sort something alphabetically?
contributed by extremely

I gotta chime in here and point out that a simple sort with { lc($a) cmp lc ($b) } may not be what you want. You may wish to do a fancier sort like the second one in this example:

#!/usr/bin/perl -w my @un = <DATA>; print "once:\n"; print sort { lc($a) cmp lc($b) } @un; print "\nagain:\n"; print sort { (lc($a) cmp lc($b)) or ($a cmp $b) } @un; __DATA__ Mark MARK mark Dave DAVE DAVEY Davey davey MarkY
Answer: How do I sort something alphabetically?
contributed by clemburg

If you are into advanced sorting orders you will want to look at Sort::ArbBiLex, which supports the construction of arbitrary sort orders.

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