Question

how come every time you make a change to one reference of a array it does not make a change on another either though both point to the same object.

Example:

myArray = new Array(5,5,5);
Array2 = new Array(7,7,7);
alert(myArray)  // still equals 5,5,5,`

Answer 1

That’s what’s meant by instances. Array is a constructor. You create an instance by using the keyword new. So, using var myArr = new Array(5,5,5) the variable myArr is a reference to an instance created (‘constructed’) by the Array constructor.

In the case of Strings, Arrays and Objects using literals creates instances too, by the way:

var myArr = [5,5,5],
    myStr = '[5,5,5]',
    myObj = {myArr:[5,5,5]};