[javascript] Does JavaScript pass by reference?

I can't see pass-by-reference in the examples where people try to demonstrate such. I only see pass-by-value.

In the case of variables that hold a reference to an object, the reference is the value of those variables, and therefore the reference is passed, which is then pass-by-value.

In a statement like this,

var a = {
  b: "foo",
  c: "bar"
};

the value of the 'a' is not the Object, but the (so far only) reference to it. In other words, the object is not in the variable a - a reference to it is. I think this is something that seems difficult for programmers who are mainly only familiar with JavaScript. But it is easy for people who know also e.g. Java, C#, and C.

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