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From: Ben Bacarisse <ben.usenet@bsb.me.uk>
Newsgroups: comp.lang.javascript
Subject: Re: understanding the expression "ws && ~[2, 3].indexOf(ws.readyState)"
Date: Sat, 28 Jan 2017 15:33:38 +0000
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"Evertjan." <exxjxw.hannivoort@inter.nl.net> writes:
<snip>
>> Le 27/01/2017 … 12:36, Ben Bacarisse a ‚crit :
>>> Any non-zero number (other than NaN) is considered to be true in a
>>> Boolean context.
>
> Please reconsider:

What should I be re-considering?

> alert(0 == false) // true
> alert(0 === false) // false
>
> alert(17 == true) // false ???????????
> alert(true == 17) // false ???????????
> alert(!!17) // true

There is only one example of a non-zero number in a Boolean context
there and it behaves as I described.

Maybe I should have been explicit about what I meant by a Boolean
context.  It's where the abstract toBoolean operation is used in the
language specification.

<snip>
-- 
Ben.