Multiple return values in Go - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does it mean when a Go function has multiple return values?

It means the function can send back more than one result at the same time, like returning both a value and an error.

beginner

How do you declare a function in Go that returns two values, an int and an error?

You write the return types in parentheses, like: func example() (int, error).

beginner

Why are multiple return values useful in Go?

They let you return extra information, like an error, without needing special structures. This helps keep code simple and clear.

intermediate

Given this function signature: func divide(a, b int) (int, error), what should the function return if b is zero?

It should return zero and an error explaining division by zero is not allowed.

beginner

How do you capture multiple return values from a function call in Go?

You assign them to multiple variables separated by commas, like: result, err := divide(10, 2).

What is the correct way to declare a Go function that returns a string and an error?

A func example() string error

B func example() (string, error)

C func example() string, error

D func example() (string error)

In Go, multiple return types are enclosed in parentheses and separated by commas.

How do you receive two return values from a Go function call?

A result := function()

B result; err := function()

C result, err := function()

D result err = function()

Use comma-separated variables with := to receive multiple return values.

Why might a Go function return an error as a second value?

A To confuse the programmer

B To return a second result always

C To slow down the program

D To indicate if something went wrong during execution

Returning an error helps the caller know if the function succeeded or failed.

What happens if you ignore the second return value (error) in Go?

A You can ignore it but risk missing errors

B The program will not compile

C The function returns only one value

D The error is automatically handled

You can ignore the error but it is risky because you might miss important problems.

Which of these is a valid way to return multiple values in Go?

A return value1, value2

B return (value1, value2)

C return [value1, value2]

D return {value1, value2}

Go returns multiple values separated by commas without extra brackets.

Explain how multiple return values work in Go and why they are useful.

Think about how functions can send back both results and errors.

Describe how you would write and call a Go function that returns a number and an error.

Remember to use parentheses for return types and comma to receive values.