Quiz: TypeScript. Interfaces and Classes.

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Consider the following interface and function:

interface Person {
readonly firstname: string;
middlename?: string;
surname: string;
}

function getFullName(p: Person): string {
if (p.middlename !== null && p.middlename !== undefined)
{
if (p.firstname !== null && p.firstname !== undefined)
{
return `${p.firstname} ${p.middlename} ${p.surname}`;
}
else
{
return `${p.middlename} ${p.surname}`;
}
}
else
{
return `${p.firstname} ${p.surname}`;
}
}

Which of the following code snippets will output "John Doe"? Select all that apply.

let fullname = getFullName({ title: "Mr", firstname: "John", surname: "Doe" });
console.info(fullname);
let myName = { title: "Mr", firstname: "John", surname: "Doe" }
let fullname = getFullName(myName);
console.info(fullname);
let myName: Person = { firstname:"Johnathan", surname: "Doe" }
myName.firstname = "John";
let fullname = getFullName(myName);
console.info(fullname);
let myName: Person = { middlename:"John", surname: "Doe" }
let fullname = getFullName(myName);
console.info(fullname);

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	Created by Levon Badalian about 7 years ago