Isn't it tricky?
My understanding:
null == undefined
null != 0
null != ""
0 == ""
0 == false
"" == false
so "if (x)..." will be false for x = 0, "", null, or undefined
and "if (x==null)" will only be true for null or undefined, not 0 or ""
On Thu, Sep 19, 2013 at 8:05 AM, Angel Herráez <angel.herr...@uah.es> wrote:
> > I took the opportunity to get rid of references to "undefined" ---
> > let me know if you think I'm in error there.
>
> Sorry, I cannot say. I have no authority on these things. And the &&
> syntax confuses me.
>
> All I have previously read about these things is to use "typeof" and
> to use strict equality, that is === or !==
>
> I would guess that the value may indeed be undefined if the variable
> has not been declared and (maybe) null or undefined? if it was
> initialized without a value.
> All these variables are indeed defined in Jmol2.js, are they not?
> Then.... I got lost :(
>
>
>
>
>
>
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--
Robert M. Hanson
Larson-Anderson Professor of Chemistry
St. Olaf College
Northfield, MN
http://www.stolaf.edu/people/hansonr
If nature does not answer first what we want,
it is better to take what answer we get.
-- Josiah Willard Gibbs, Lecture XXX, Monday, February 5, 1900
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