Multiple equality operators at once

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This might be a stupid question, but how do I compare multiple variables at once?

Say I have 3 varaibles: a, b and c, and I need to check whether they are all the same. Of course, a==b && b==c works, but is there a shorter syntax like a==b==c (this doesn't work)?

Posted 29-Aug-10 6:44am

pimb2

Updated 29-Aug-10 6:46am

v3

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3 solutions

Solution 1

No shorter syntax, that is all you get.

Posted 29-Aug-10 9:01am

Not Active

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Dalek Dave 29-Aug-10 20:21pm

I think there is.

Solution 2

try...

if (a-a)=(b-c)

Posted 29-Aug-10 14:21pm

Dalek Dave

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[no name] 29-Aug-10 21:48pm

Sorry I don't see how this is any shorter syntatically. Although the OP asked in reference to JavaScript if you compare the two methods in C# yours has one less instruction.

AspDotNetDev 30-Aug-10 0:27am

DD, (a-a) will always be 0. That is, if a, b, and c are numbers at all (the OP didn't indicate that).

pimb2 30-Aug-10 1:35am

Actually, it are objects that I'm comparing so that's not really a solution I'm afriad...

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AspDotNetDev · Accepted Answer · 2010-08-29T18:24:00

Solution 3

You could create a function that takes a list of variables and compares them all to another item (you'd use a for loop). You would use it something like this:

JavaScript

var matchesAll = EqualsAll(b, [a, c, d, e, f, g]);

That only cuts down on how much you have to type if you have a lot of variables though.

Posted 29-Aug-10 18:24pm

AspDotNetDev

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pimb2 30-Aug-10 1:35am

This quite appeals to me, thanks!