Quiz: TypeScript. Basic Types and Variable Declarations.

Question 1

Please select correct basic types that are available in TypeScript:

Accepted Answer

string, boolean, enum, null, never

Answer

number, null, binary, string, boolean

Answer

boolean, char, string, number

Answer

boolean, number, int, enum, void

Question 2

Please select correct TypeScript variable declarations. Choose all that apply.

Accepted Answer

let z = "My String";

Accepted Answer

let a: string = "My String";

Accepted Answer

let b = ("My String" as string);

Answer

x = "My String";

Answer

let myAge: int = 25;

Answer

let c as string = "My String";

Question 3

let variable declaration is accessible anywhere within their containing function, module, namespace, or global scope.

Answer

true

Question 4

Please use drag and drop to make sure that variable sentence contains the following string: "Hello, my name is Joe Bloggs. I'm 44 years old."

let myName = "Joe Bloggs";
let myAge: number = 44;

let sentence: string = `Hello, my name is [blank_start]${myName}[blank_end]. I'm  [blank_start]${myAge}[blank_end] years old.`;

Accepted Answer

${myName}

Accepted Answer

${myAge}

Answer

{myName}

Answer

{$myName}

Answer

$myName

Answer

$myAge.toString()

Answer

{$myAge.toString()}

Answer

{$myAge}

Question 5

The following code will output in the console:

enum make { Audi = 100, BMW = 200, Citroen=300, Ford, Holden, Hyundai, Jaguar, Kia, Lada }

let myCarMake: make = make.Ford;

console.info(myCarMake.toString());

Accepted Answer

301

Answer

Ford

Answer

400

Answer

syntax error

Questions in this quiz (5)