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From: Ben Bacarisse <ben.usenet@bsb.me.uk>
Newsgroups: comp.lang.javascript
Subject: Re: passing a set of numbers to a function
Date: Fri, 29 Jan 2016 12:23:53 +0000
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John Harris <niam@jghnorth.org.uk.invalid> writes:

> On Fri, 29 Jan 2016 10:09:17 +0000, Ben Bacarisse
> <ben.usenet@bsb.me.uk> wrote:
>
>   <snip>
>>Sets don't contain duplicates
>   <snip>
>
> How can you tell?

x not in (S \ {x}).  |{x}| = 1.  x in S => |S \ {x}| = |S| - 1.  These
are inconsistent with my understanding of the metaphor of duplication
(though I accept it might have other nuances for other people).

>   x is a member; x is a member; x is a member. 
> Does that tell you if there is duplication, or not? Remember, there's
> no other way to look inside a set.

If you are allowed metaphors like "look" and "inside", so am I!

-- 
Ben.