TypeScript Functions Quiz

What is the return type of the function 'greet'?

• void

• boolean

• number

• string

Which of the following is a valid parameter type in TypeScript?

• string

• float

• text

• integer

What does the '?' signify in the function 'log'?

• It indicates an optional parameter.

• It indicates a default value.

• It indicates a required parameter.

• It indicates a return type.

What is the purpose of the 'add' function?

• To subtract two numbers.

• To concatenate two strings.

• To return the sum of two numbers.

• To log a message.

In the function 'subtract', what are the types of parameters x and y?

• string

• boolean

• number

• void

How would you define a function that takes two numbers and returns their product?

• function multiply(a: number, b: number): number { return a * b; }

• function multiply(a: string, b: string): number { return a * b; }

• function multiply(a: number, b: number): boolean { return a * b; }

• function multiply(a: number, b: number): void { return a * b; }

What is the output of the function 'log' if called with 'Hello' and 'INFO'?

• Hello

• [DEBUG] Hello

• [INFO] Hello

• [ERROR] Hello

Which of the following statements about TypeScript functions is true?

• TypeScript functions must always return a value.

• TypeScript functions cannot have return types.

• TypeScript functions do not support arrow syntax.

• TypeScript functions can have optional parameters.

If you want to create a function that does not return any value, which return type should you use?

• undefined

• null

• void

• string

What is the main advantage of using arrow functions in TypeScript?

• They do not support type annotations.

• They cannot be used as methods.

• They have a shorter syntax.

• They are more verbose.