Question

var x = 'hello';
var x = 'world';

function foo(){
    var y = x = 'hello from foo';
}
foo();

Is it x = ‘hello from foo’, y = ‘hello from foo’?

Answer 1

With your code, x is 'hello from foo', y is undefined.

In foo, you assigned 'hello from foo' to the global variable x, and then assigned it x to the local variable y.