I just created two arrays and assigned a inserted a key value pair to one of the array. Then i assigned or copy an array to other. After that i added another key value pair to second array, but it reflects to the original array also. For example.
var array1 =[];
var array2 =[];
array1.value1 ='1';
array2 = array1;
array2.value2 ='2';
console.log(array1); // it prints {value1:1, value2:2}
why its changing the array1 object while i added a key value pair for array2?
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;
By doing array2 = array1; you are assigning the array1 object to array2 variable. So modifying array2 will modify the object associated i.e. array1
Because you pass by reference array1 to array2. You need to do a copy like:
array2 = new Array(array1);
