JavaScript:
// Add a method to the Person's prototype called "getInitials" that returns the first letter of their first and last name, both capitalized.
function Person(firstName, lastName) {
Person.prototype.getInitials = function() {
let name = "first last";
let initials = Array.prototype.map.call(name.split(" "), function(x){ return x.substring(0,1).toUpperCase();}).join('');
};
}
/* Do not modify code below this line */
const johnDoe = new Person('john', 'doe');
console.log(johnDoe.getInitials(), '<-- should be "JD"');
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