In JavaScript Primitives are immutable, which means that the value is passed instead of reference.
For Objects the reference is passed instead of value. Example as below,
//Primitives are immutable
var a = 10;
var b = a;
console.log("a: "+a);
console.log("b: "+b);
a =20;
console.log("a: "+a);
console.log("b: "+b);
//Mutable
var c = {name: "Zack"};
var d = c;
console.log("c: "+c.name);
console.log("d: "+d.name);
d.name = "Arnold";
console.log("c: "+c.name);
console.log("d: "+d.name);
Ensure whether you are passing value or reference during development. This is one of the basic concepts in JavaScript.
