How to define an al parameter in TypeScript?

• name[]
• name{}
• name?
• name=

Which type represents values that never occur?

• void
• undefined
• never
• null

Which interface keyword is correct in TypeScript?

• declare
• interface
• class
• type

What is the purpose of enum in TypeScript?

• Create constant arrays
• Handle API requests
• Store multiple types
• Define a set of constants

Which type is used when you don't want to return anything?

• null
• undefined
• void
• never

What is Type Inference in TypeScript?

• Manually declaring types
• TypeScript guesses the type
• Adding external libraries
• Ignoring types

What does a union type allow in TypeScript?

• Multiple values
• One of several types
• Only one fixed type
• Functions as types

Which syntax represents a union type?

• string number
• string | number
• string & number
• string, number

What is an intersection type?

• A type that combines multiple types
• A single type
• Type with conditions
• None of the above

What is a type alias?

• A function shortcut
• A reusable custom type name
• A JavaScript class
• An external file

What does a TypeScript conditional type look like?

• A extends B ? X : Y
• if A then B else C
• typeof A == B ? C : D
• A ? B : C

Which utility type makes all properties al?

• Partial<T>
• Required<T>
• Readonly<T>
• Pick<T>

What is the purpose of keyof in TypeScript?

• Get object values
• Get property names as a union
• Clone types
• Filter arrays

What is declaration merging?

• Combining interfaces
• Merging modules and classes
• Overriding types
• All of the above

Which keyword is used in user-defined type guards?

• guard
• is
• as
• typeof