28. Passing Objects into Functions


Not sure how to proceed here, I am completely lost it seems.
I thought this would be the proper way:
// Our person constructor
function Person (name, age) {
this.name = name;
this.age = age;

// We can make a function which takes persons as arguments
// This one computes the difference in ages between two people
var ageDifference = function(person1, person2) {
return person1.age - person2.age;

var alice = new Person("Alice", 30);
var billy = new Person("Billy", 25);

// get the difference in age between alice and billy using our function
var diff = function(15){
return alice.age - billy.age;

However I am getting:
SyntaxError: Unexpected number '15'. Expected a parameter pattern or a ')' in parameter list.
Any explanation would be greatly appreciated


var diff = function(15){
return alice.age - billy.age;

The code above makes diff a new function. Since we already have the function ageDifference, delete this chunk of code.

We want to: Complete line 17 by calling ageDifference and saving the result in our global diff variable.

var diff = ageDifference(alice, billy);

I hope this makes sense! :smile:


Makes perfect sense!! Thanks, it gets hard to remember all these things sometimes


Good I'm glad! Remember that everything just takes practice : )