Re: Order of modifiers and flags in parameter expansion

Re: Order of modifiers and flags in parameter expansion

[Bart Schaefer]

[> zsh-workers]

On Mar 18, 11:08am, Peter Stephenson wrote:
} Subject: Re: Order of modifiers and flags in parameter expansion
}
} +item(tt(10.) em(Uniqueness))(
} +item(tt(11.) em(Ordering))(

That's funny.  Why do it in that sequence?  Seems like (a) it doesn't
matter to the end result [unless there's a 10.5 that's still not
documented], and (b) it would be more efficient to remove duplicates
after sorting than before.

Re: Order of modifiers and flags in parameter expansion

[Peter Stephenson]

Bart Schaefer wrote:
> [> zsh-workers]
> 
> On Mar 18, 11:08am, Peter Stephenson wrote:
> } Subject: Re: Order of modifiers and flags in parameter expansion
> }
> } +item(tt(10.) em(Uniqueness))(
> } +item(tt(11.) em(Ordering))(
> 
> That's funny.  Why do it in that sequence?  Seems like (a) it doesn't
> matter to the end result [unless there's a 10.5 that's still not
> documented], and (b) it would be more efficient to remove duplicates
> after sorting than before.

A possible clue is the intervening bit I missed out, which checks if
there's still an array after making it unique and if not handles a
single element.  Sorting doesn't affect this.  You can't rely on the
list being sorted, so it must handle any combination.  I doubt it makes
that much difference in practice; the typical uses for unique lists
that I can think of aren't ordered.

-- 
Peter Stephenson <pws@csr.com>                  Software Engineer
CSR PLC, Churchill House, Cambridge Business Park, Cowley Road
Cambridge, CB4 0WZ, UK                          Tel: +44 (0)1223 692070


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