Vararg parameters in Kotlin - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does vararg mean in Kotlin function parameters?

vararg allows a function to accept zero or more arguments of the specified type as a single parameter.

It lets you pass multiple values without creating an array explicitly.

beginner

How do you call a Kotlin function that has a vararg parameter?

You can pass multiple arguments separated by commas, or pass an array using the spread operator *.

Example: fun printAll(vararg strings: String) can be called as printAll("a", "b", "c") or printAll(*arrayOf("a", "b")).

intermediate

Can a Kotlin function have more than one vararg parameter?

No, a function can have only one vararg parameter.

If there are other parameters, they must come before or after the vararg parameter, but only one can be vararg.

beginner

What type does a vararg parameter have inside the function?

Inside the function, the vararg parameter is seen as an array of the specified type.

For example, vararg numbers: Int is treated as IntArray inside the function.

beginner

Why use vararg instead of an array parameter?

vararg makes calling the function easier and cleaner because you can pass multiple arguments directly without creating an array.

It improves readability and convenience.

What keyword is used in Kotlin to allow a function to accept multiple arguments as one parameter?

A multiple

B spread

C vararg

D params

vararg is the correct keyword to accept multiple arguments in Kotlin.

How do you pass an existing array to a vararg parameter?

A Just pass the array directly

B Convert the array to a list first

C You cannot pass an array to a vararg parameter

D Use the spread operator <code>*</code> before the array

You use the spread operator * to pass an array to a vararg parameter.

Inside the function, a vararg parameter is treated as:

A An array

B A single value

C A map

D A list

Inside the function, a vararg parameter is an array of the specified type.

Can a Kotlin function have two vararg parameters?

A No, only one <code>vararg</code> parameter is allowed

B Yes, always

C Yes, but only if they have different types

D Only if they are at the end of the parameter list

Kotlin allows only one vararg parameter per function.

Which of these is a benefit of using vararg parameters?

A You must always create an array before calling the function

B It makes function calls cleaner by allowing multiple arguments directly

C It restricts the number of arguments to one

D It automatically converts arguments to strings

vararg lets you pass multiple arguments directly, making calls cleaner and easier.

Explain what vararg parameters are and how you use them in Kotlin functions.

Think about how you can pass many values to one parameter.

Describe the rules and limitations when using vararg parameters in Kotlin functions.

Consider how many varargs you can have and where they appear.