JavaScript Memory efficiency Drawback of creating true private method
Example
One drawback of creating private method in Javascript is memory-inefficient because a copy of the private method will be created every time a new instance is created. See this simple example.
function contact(first, last) {
this.firstName = first;
this.lastName = last;
this.mobile;
// private method
var formatPhoneNumber = function(number) {
// format phone number based on input
};
// public method
this.setMobileNumber = function(number) {
this.mobile = formatPhoneNumber(number);
};
}
When you create few instances, they all have a copy of formatPhoneNumber method
var rob = new contact('Rob', 'Sanderson');
var don = new contact('Donald', 'Trump');
var andy = new contact('Andy', 'Whitehall');
Thus, would be great to avoid using private method only if it's necessary.
