JavaScript define and return a variable on one line

Question

In JavaScript, if I want to return a variable but don\'t want to modify it or leak it into the global scope, can I define and return it on one line like this?

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Answer 1

Well, you'll definitely need to declare the variable in the scope you want it in. You can then set the value, and return it in one line:

var Foo; // Declares Foo in this scope, though this expression has no L-Value
return (Foo = 'bar'); // Sets Foo to 'bar' and returns the value of Foo

It's questionable why you're doing this though. Ideally, Foo would be declared somewhere else in some parent scope. Or, you'd return a new function that would enclose the value of Foo.