JavaScript array assign issue [duplicate]

Answer 1

When you do something like array2 = array1; you are just setting array2 as a reference to array1. To make a copy of array1 you need to do array2 = array1.slice();

Furthermore, you can not set Array elements with array1.value1 ='1';. What you have done there is convert your array to an Object. So what you really should be doing is:

var array1 = [];
var array2 = [];
array1[0] = 1;
array2 = array1.slice();
array2[1] = 2;

Answer 2

By doing array2 = array1; you are assigning the array1 object to array2 variable. So modifying array2 will modify the object associated i.e. array1

Answer 3

Because you pass by reference array1 to array2. You need to do a copy like:

array2 = new Array(array1);