JavaScript private methods

Question

To make a JavaScript class with a public method I\'d do something like:

function Restaurant() {}

Restaurant.prototype.buy_food = function(){
   // something         


        

Answer 1

I prefer to store private data in an associated WeakMap. This allows you to keep your public methods on the prototype where they belong. This seems to be the most efficient way to handle this problem for large numbers of objects.

const data = new WeakMap();

function Foo(value) {
    data.set(this, {value});
}

// public method accessing private value
Foo.prototype.accessValue = function() {
    return data.get(this).value;
}

// private 'method' accessing private value
function accessValue(foo) {
    return data.get(foo).value;
}

export {Foo};