The primitive types (number, string, etc.) are passed by value, but objects are unknown, because they can be both passed-by-value (in case we consider that a variable holding an object is in fact a reference to the object) and passed-by-reference (...

This question already has answers here:...

This question already has answers here:...

I know that in JS, objects are passed by reference, for example:  function test(obj) {     obj.name = 'new name'; }  var my_obj = { name: 'foo' }; test(my_obj); alert(my_obj.name); // new name   But why doesn't the below work:...

i have a object, which is getting passed in many different functions inside a function. these functions may or may not change the value of the object, but if they do change it, then i would like to get the latest changes on object.  following is wh...

I want to create a string and pass it by reference such that I can change a single variable and have that propagate to any other object that references it.  Take this example:  function Report(a, b) {     this.ShowMe = function() { alert(a + "...

This question already has answers here:...

I have a array like this:  users = [{id:1, name:'name1'},{id:2, name:'name2'}]   How could I get a reference to the item {id:2, name:'name2'}, so I can change it is name property, like:  user = get_item(users, 'id', 2)...

I'm trying to have both the variables "my_a" and letters.a point to the same object.  //i want letters.a to reference (point to) my_a, not be a copy... //expected output should be: letters.a = c //made variables into Objects.. but didn...

In Javascript The Good Parts, it states:     So I would expect the following code example to output 1001 since "objects are never copied but passed around by reference", so why does it output 0000?  var page_item = {   id_code : 'welcome&...