Receiver types in Go - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a receiver in Go methods?

A receiver is a special parameter in Go that allows a function to be called as a method on a type. It appears before the method name and defines which type the method belongs to.

beginner

What is the difference between a value receiver and a pointer receiver in Go?

A value receiver gets a copy of the value, so changes inside the method do not affect the original. A pointer receiver gets the address, so changes inside the method can modify the original value.

intermediate

Why would you use a pointer receiver instead of a value receiver?

Use a pointer receiver to modify the original data, avoid copying large structs for efficiency, or to ensure consistency when methods need to share the same data.

intermediate

Can methods with pointer receivers be called on value types in Go?

Yes. Go automatically takes the address of the value to call pointer receiver methods, so you can call pointer receiver methods on values directly.

intermediate

What happens if you define a method with a value receiver and call it on a pointer type?

Go automatically dereferences the pointer to call the method with a value receiver, so the method works on the value the pointer points to.

In Go, what does a pointer receiver allow you to do?

A Copy the value to a new variable

B Only read the value without modification

C Prevent the method from being called

D Modify the original value inside the method

Pointer receivers allow methods to modify the original value by working with its memory address.

Which receiver type copies the value when a method is called?

A Value receiver

B Channel receiver

C Interface receiver

D Pointer receiver

Value receivers get a copy of the value, so changes inside the method do not affect the original.

Can you call a method with a pointer receiver on a value variable in Go?

A No, it causes a compile error

B Yes, Go automatically takes the address

C Only if the value is a pointer type

D Only if the method is exported

Go automatically takes the address of the value to call pointer receiver methods.

Why might you avoid using value receivers for large structs?

A Because value receivers cause runtime errors

B Because value receivers cannot modify the struct

C Because copying large structs is inefficient

D Because value receivers require pointers

Copying large structs can be slow and use more memory, so pointer receivers are preferred.

What does Go do if you call a value receiver method on a pointer variable?

A Automatically dereferences the pointer

B Throws a compile-time error

C Converts the pointer to an interface

D Calls the method on the pointer itself

Go automatically dereferences the pointer to call the value receiver method on the underlying value.

Explain the difference between value receivers and pointer receivers in Go methods.

Think about whether the method can change the original data or just a copy.

Describe how Go handles calling methods with pointer receivers on value variables and vice versa.

Go helps by converting between pointers and values when calling methods.