Javascript Function-Pointer Assignment

Question

Consider this javascript code:

var bar = function () { alert(\"A\"); }
var foo = bar;
bar = function () { alert(\"B\"); };
foo();

When runn

Answer 1

You are assigning the value of an anonymous function to a variable not a pointer.
If you want to play with pointers, you can use objects that are passed by reference, not copy.

Here are some examples:

"obj2" is a reference of "obj1", you change "obj2", and "obj1" is changed. It will alert false.

var obj1 = {prop:true},
    obj2 = obj1;
obj2.prop = false;
alert(obj1.prop);

"prop" points to a property that is not an object, "prop" is not a pointer to this object but a copy. If you change "prop", "obj1" is not changed. It will alert true

var obj1 = {prop:true},
    prop = obj1.prop;
prop = false;
alert(obj1.prop);

"obj2" is a reference to the "subObj" property of "obj1". if "obj2" is changed, "obj1" is changed. It will alert false.

var obj1 = {subObj:{prop:true}},
    obj2 = obj1.subObj;
obj2.prop = false;
alert(obj1.subObj.prop);