8712786
Descripción
Test por Levon Badalian, actualizado hace más de 1 año
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Creado por Levon Badalian
hace más de 7 años
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Pregunta 1
Pregunta
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.
Respuesta
-
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);
Pregunta 2
Pregunta
Which of the following keywords can be used in TypeScript to implement interface and inheritance. Choose all that appy.
Respuesta
-
implements
-
inherits
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super
-
base
-
extends
Pregunta 3
Pregunta
Which of the following is possible to do in TypeScript? Choose all that apply.
Respuesta
-
class implements interface
-
class extends interface
-
interface extends interface
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interface extends class
-
interface implements class
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interface implements interface
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