This isn't how we create public and private code inside though,
we do it by what's being returned using closure.
We returned an object which is exposed to the caller.
The keyword is "closure", an example is visible in a constructor-function:
function Person(firstName, lastName) {
function fullName() {
return `${firstName} ${lastName}`;
}
this.introduce = function() {
console.log(fullName());
}
}
When a Person is created we can call introduce on it, but not fullName, essentially making fullName private.
Keep in mind, closures are not limited to constructors! A closure is defined as "a function with its variable scope". Simplified that means that a function 'remembers' the scope it was defined in.
Can you elaborate as if I am five?
I was about to write an elaborate explanation, but Douglas Crockford already wrote an extensive article about this 😄:
crockford.com/javascript/private.html
The keyword is "closure", an example is visible in a constructor-function:
When a Person is created we can call
introduceon it, but not fullName, essentially making fullName private.Keep in mind, closures are not limited to constructors! A closure is defined as "a function with its variable scope". Simplified that means that a function 'remembers' the scope it was defined in.
I hope it helps!
For more info you can check developer.mozilla.org/en-US/docs/W...