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Re: filter and filter-out functions do they preserve order
From: |
Nicholas Mc Guire |
Subject: |
Re: filter and filter-out functions do they preserve order |
Date: |
Fri, 14 Aug 2009 19:01:53 +0200 |
User-agent: |
Mutt/1.5.18 (2008-05-17) |
On Fri, 14 Aug 2009, Krzysztof Cieniuch wrote:
> Hi,
>
> Short question as in subject does filter function preserves original
> elements order
> I did some tests like:
> org:= a b c d e
> res:=$(filter a d c,$(org))
> $(info $(res))
>
> and this prints a c d so it looks like it preserves order but can I
> relay on that
> or is this just coincidence in my simple example ?
>
If you need to rely on order then simply use sort to ensure lexical
order - then you don't need to bother with possible implementation
details (the info page does not say anything about preserving order)
hofrat