Pass By Reference Vs Pass By Value, which of these two JavaScript follows? Well JS is pretty good at handling both the pass by reference and pass by value. Let’s look into the basic definition of both the methods first and then dig into How JS uses these methods.

Pass By Reference: Imagine, you and your friend are on a same boat and you want to reach somewhere, if the boat has reached the other end of the river then both you and your friend will also been reached. So, one’s status is affecting other’s status.

Pass By Value:  Here each will be sailing in their own boats, so if one boat has reached the other end of the river, it doesn’t mean that other boats had also reached the end. So, here one boat is independent on other boats.  

How JavaScript is handling both the methods?

JS follows pass by reference  in case of objects and arrays i.e., if they are passed to a function and the values inside the function are assigned to a new value then it does affects the original value as well.

It follows pass by value in case of variables like  boolean, string, number i.e., if they are passed to a function and the values inside the function are assigned to a new variable then it doesn’t going to affect the original value.