Understanding the bind method. Reference vs value

I don’t know if this is a dumb question, but i will ask it anyways.

I saw in a javascript course that we can use the bind method on functions to create basically the same functions but more specific. So like this for example:

const addTax = (rate, value) => value + value * rate;

                           null because we don't need this 
const addVAT = addTax.bind(null, 0.23); 

So basically what we’re doing here is that we create a new function called addVAT based on the addTax function but the difference is that we set the rate hardcoded at 0.23.

Now to my question: Since functions are objects and objects are passed by reference, shouldn’t the addTax function become now the addVAT function because they both point to the same reference, just like here?:

const person = {
  name: 'test',
};
const person1 = person;
person1.age = 20;

Because when we initalize person1 to person and when we add the property age to person1 it also adds to person

>Solution :

No.

First you create a function and assign it to addTax

const addTax = (rate, value) => value + value * rate;

Then you call the bind method of that function and assign its return value to addVAT.

const addVAT = addTax.bind(null, 0.23); 

The purpose of the bind method is to create a new function and return it.

It doesn’t just return the original function (which would be pointless).

The value of addVAT is the new function created by bind.