03 Values and Variables

What is the meaning of primitive values being immutable ?

We can’t change primitive values. For example we have this code:
let a = ‘abc’

a[0] = ‘d’

console.log(a)
What is the output of this code ?

Can we set a property on a primitive value ?

No, we can’t. If you try to do so, it will not work.

“Primitive valuse are read-only.” is this statement true ?

yes, they are immutable. We can’t change them.

Are variables values ?

No, they are not. They point to values.

Is the following statement correct ? “Variables do not point to values.“

Incorrect. Variables point to values. They are not values themselves.

What is variable in javascript universe ?

A variable is a wire that points to a value in our js universe.

is 2 an expression in the code: let a = 2; ?

yes, 2 is a literal expression because it literally results in value 2.

explain this code:
console.log(pet) ?

This code is asking javascript to follow the wire named as “pet” and then log the value that the wire is pointing to.