8712786
Description
Quiz by Levon Badalian, updated more than 1 year ago
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Created by Levon Badalian
about 7 years ago
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Question 1
Question
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.
Answer
-
let fullname = getFullName({ title: "Mr", firstname: "John", surname: "Doe" }); console.info(fullname);
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let myName = { title: "Mr", firstname: "John", surname: "Doe" } let fullname = getFullName(myName); console.info(fullname);
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let myName: Person = { firstname:"Johnathan", surname: "Doe" } myName.firstname = "John"; let fullname = getFullName(myName); console.info(fullname);
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let myName: Person = { middlename:"John", surname: "Doe" } let fullname = getFullName(myName); console.info(fullname);
Question 2
Question
Which of the following keywords can be used in TypeScript to implement interface and inheritance. Choose all that appy.
Answer
-
implements
-
inherits
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super
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base
-
extends
Question 3
Question
Which of the following is possible to do in TypeScript? Choose all that apply.
Answer
-
class implements interface
-
class extends interface
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interface extends interface
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interface extends class
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interface implements class
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interface implements interface
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