[Solved] Declaring JavaScript variable [closed]

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The “best” way is the way you and your colleagues decide upon and verify with a linting tool.

Here are some suggestions:

var a;
var b;
var c;
a = false;
b = "";
c = {};

–

var a = false;
var b = "";
var c = {};

–

var a = false, b = "", c = {};

–

var a = false,
    b = "",
    c = {};

–

var a, b, c;
a = false;
b = "";
c = {};

I don’t know enough about the different JavaScript engine vendors to make this statement but my assumption is that all of the above are functionally and performance equivalent. If you are using a minifying tool like YUICompiler or Google Closure Compiler the above samples will all compile to the same output*.

* It looks like Google Closure Compiler likes to keep the var and definition separate if you had that in your original code. var a,b,c;a=!1;b="";c={}; vs var a=!1,b="",c={};

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solved Declaring JavaScript variable [closed]