JavaScript closures and name clobbering
Are variables defined inside an inner function that have the same name as a variable in an outer function isolated from the outer variable?

    function() {
        var myTest = "hi there";
        ( function( myTest ) {
            myTest = "goodbye!";
        } )();
        console.log( myTest ); // myTest should still be "hi there" here, correct?
    }

Naturally if I didn't *declare* `myTest` inside the inner function it would create a closure and modify the original. I just want to make sure that variables declared within an inner function are always isolated to that function even if their name may conflict with an outer scope.
JavaScript closures and name clobbering
===

Are variables defined inside an inner function that have the same name as a variable in an outer function isolated from the outer variable?

    function() {
        var myTest = "hi there";
        ( function( myTest ) {
            myTest = "goodbye!";
        } )();
        console.log( myTest ); // myTest should still be "hi there" here, correct?
    }

Naturally if I didn't *declare* `myTest` inside the inner function it would create a closure and modify the original. I just want to make sure that variables declared within an inner function are always isolated to that function even if their name may conflict with an outer scope.