Scope in javascript acting weird

Question

Object are passed with their reference in javascript. Meaning change in that object from any where should be reflected. In this case, the expected output was {} for console.log(

Answer 1

If you added another line you can get a clearer picture of what is happening:

function change(a,b) {
    a.x = 'added';
    a = b;
    a.x = 'added as well';
};
a={};
b={};
change(a,b);
console.log(a);  //{x:'added'}
console.log(b);  //{x:'added as well'}

When you're doing a = b you're assigning the local variable a to the reference that b is holding.