/*jshint esversion:6*/

/********************************************************************************************************************

* Default Parameter

* -----------------

* In ES5, if a parameter was optional, we had to handle it separately by checking whether that param is undefined or

* not, but in ES6, we need not do that, as we can handle the default value for a function parameter extremely easily

*/

// Assume that we are using a function constructor for Smith Family to define the people inside the Smith Family

// as follows:

// ES5

function SmithPerson5(firstName, yearOfBirth, lastName, nationality) {

}

var john5 = new SmithPerson5("John", 1990);

console.log(john5); // Without line #15 & #16, john.lastName and john.nationality would be undefined

// If emily got married into Diaz family and moved to spain, then

var emily5 = new SmithPerson5("Emily", 1992, "Diaz", "spanish");

console.log(emily5);

// In ES6, we can assign default values to the parameters while declaring the function as follows:

// ES6

function SmithPerson6(firstName, yearOfBirth, lastName = "Smith", nationality = "american") {

}

let john6 = new SmithPerson6("John", 1990);

console.log(john6);

// If emily got married into Diaz family and moved to spain, then

let emily6 = new SmithPerson6("Emily", 1992, "Diaz", "spanish");

console.log(emily6);