Function declaration with ternary operator

Question

Is it possible to use a ternary operator to declare the function name?

var foo,
    bar = 'bar';

(foo || bar) = function(){ // Invalid left-hand side in assignment [Bad assignment]
    alert(true);
};

[foo || bar] = function(){ // Invalid left-hand side in assignment [Bad assignment]
    alert(true);
};

(foo ? foo : bar) = function(){ // Invalid left-hand side in assignment [Bad assignment]
    alert(true);
};

Answer 1

this[foo || bar] = function(){alert(true)}

Thing is, if bar equals "bar", you're going to overwrite yourself with a function...

Answer 2

What you really want is something like this?

window[foo ? foo : bar] = function (){
    alert(true);
};

Please note that "window" is not available in some environment, though all the browsers should have it.