Can a propertie value be a function that includes others properties?

Question

I want display the fullName Peter Newman with and button in this JavaScript:
<h2>Script17 JavaScript Objects ¿ERROR?</h2>
<p id="demo17" style=color:red>Display the result here</p>
<script>
var person17 = {
firstName: "Peter",
lastName : "Newman",
id : 1758,
fullName : function myFunction17() {
return firstName + " " + lastName
}
};
</script>
<button type="button" onclick='document.getElementById("demo17").innerHTML = person17.fullName'>Script17 innerHTML =
person17.fullName</button>

Answer 1

Yes, it can.
Check this out...

https://code.sololearn.com/WWYbc6dou0GI/?ref=app

Answer 2

thank you, calvin