boolean opposites

Is there a way to write this simpler?


function makeOpposite(a) {
if(!a) {
a = true;
}
else {
a = false;
}
}

re: boolean opposites

windandwaves wrote:a = !a;

--
Ian Collins.

re: boolean opposites

On Feb 15, 2:33 pm, Ian Collins <ian-n...@hotmail.comwrote:awesome! Thanks Ian...

re: boolean opposites

windandwaves wrote:Or:

a ^= true;

--
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"The blind rulers of Logres
Nourished the land on a fallacy of rational virtue."
-- Charles Williams. "Taliessin through Logres: Prelude"

re: boolean opposites

windandwaves wrote on 15 feb 2007 in comp.lang.javascript:
function makeOpposite(a) {}

Since the OP's function does not return anything
and does not change a global variable,
an empty function is the "simplest".

=============================

However I surmize the OP would like this one:

function makeOpposite(a) {return !a;};

--
Evertjan.
The Netherlands.
(Please change the x'es to dots in my emailaddress)

re: boolean opposites

On Feb 15, 4:22 am, John W. Kennedy wrote:
<snip>But then - a - is numeric not boolean.

Richard.

re: boolean opposites

In comp.lang.javascript message <1171536039.945256.56680@m58g2000cwm.goo
glegroups.com>, Thu, 15 Feb 2007 02:40:40, Richard Cornford
<Richard@litotes.demon.co.ukposted:Consequentially and more importantly, if the original a was an integer
greater than 1, then both a and the result would test as true.

It's a good idea to read the newsgroup and its FAQ. See below.

--
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re: boolean opposites

On Feb 15, 3:36 pm, Dr J R Stockton <reply0...@merlyn.demon.co.uk>
wrote:Easy enough to fix! Just cast to boolean before and after.
a = !!(!!a ^ true);

Or my favorite js wtf, found in actual production code at a company
where I once worked:
x = (!!x ? !!true : !!false);
Apparently the author wanted to make really super duper certain he got
a boolean.

--i

re: boolean opposites

On Feb 15, 6:09 pm, "Isaac Schlueter" <isaacschlue...@gmail.com>
wrote:Perhaps, but then because good coding practices demand code such as
this be readily readable and understood by others, advanced structure
would be required, e.g,

case a=!!(!!a ^ true) :-D ;

.../rh

re: boolean opposites

In comp.lang.javascript message <1171591791.910268.320200@a34g2000cwb.go
oglegroups.com>, Thu, 15 Feb 2007 18:09:51, Isaac Schlueter
<isaacschlueter@gmail.composted:That approach would not be safe in all languages. ISTR one in which
Boolean was nothing more than a predefined enumerated type in the
outermost scope, so that it would be possible to declare new variables
true and false and assign to them respectively 2>3 and 3>2.

--
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re: boolean opposites

On Feb 16, 10:07 am, Dr J R Stockton <reply0...@merlyn.demon.co.uk>
wrote:Yeah, you're right. It's been a while since I worked with VB6, but I
remember being very very confused that (Not 3) yielded -2, which is
truish. It had something to do with the fact that Not in vb6 is
always bitwise. (Similarly, 3 + True = 2.)

--i