Function parameters in Go - Cheat Sheet & Quick Revision

Recall & Review

beginner

What are function parameters in Go?

Function parameters are variables listed in a function's definition. They receive values when the function is called, allowing the function to use those values inside its code.

beginner

How do you define multiple parameters of the same type in Go?

You can list multiple parameter names followed by a single type. For example: func add(x, y int) int means both x and y are integers.

beginner

What happens if you call a function without providing all parameters?

Go requires all parameters to be provided when calling a function. Missing parameters cause a compile-time error.

intermediate

Can function parameters have default values in Go?

No, Go does not support default parameter values. You must provide all arguments when calling the function.

intermediate

What is a variadic parameter in Go?

A variadic parameter lets a function accept zero or more arguments of a specified type. It is declared with ... before the type, like func sum(nums ...int).

How do you declare two integer parameters named a and b in a Go function?

A func example(a, b int)

B func example(int a, int b)

C func example(a int, b int)

D func example(a int b int)

In Go, you list parameter names followed by their type. So 'a, b int' means both are integers. Alternatively, you can specify each parameter with its type separately as in 'a int, b int'.

What happens if you call a Go function with fewer arguments than parameters?

A Compile-time error

B Function uses default values

C Function ignores missing parameters

D Runtime error

Go requires all parameters to be provided. Missing arguments cause a compile-time error.

Which symbol is used to declare a variadic parameter in Go?

A ...

B *

C &

D $

The '...' before a type declares a variadic parameter that accepts multiple arguments.

Can Go functions have parameters with default values?

A Yes, using the 'default' keyword

B Yes, by assigning values in the function signature

C No, Go does not support default parameter values

D Only for string parameters

Go requires all arguments to be passed explicitly; it does not support default parameter values.

What is the correct way to define a function that takes any number of integers in Go?

A func sum(nums *int)

B func sum(nums ...int)

C func sum(...nums int)

D func sum(nums int[])

The '...int' syntax declares a variadic parameter accepting zero or more integers.

Explain how function parameters work in Go and how you declare multiple parameters of the same type.

Think about how you list names and types in the function signature.

Describe what a variadic parameter is in Go and how it differs from regular parameters.

It's like a function that can take many values of the same type.