GO Structs and Methods 3

Question 1

What is the correct way to call a method `Greet()` on a pointer to a struct `p *Person`?

Accepted Answer

p.Greet()

Answer

Go automatically dereferences pointers when calling methods, so `p.Greet()` and `(*p).Greet()` are both valid, but `p.Greet()` is idiomatic.

Question 2

Which of the following struct definitions is valid Go syntax?

Accepted Answer

type Employee struct { Name string; Salary float64; Manager *Employee }

Answer

Go struct syntax uses `type Name struct { ... }` with fields separated by newlines or semicolons, using no commas between field declarations.

Question 3

What is the zero value of a struct field of type `*int` in Go?

Accepted Answer

nil

Answer

Pointer fields in Go structs default to nil as their zero value because all pointer types in Go have nil as their zero value.

Question 4

How does Go handle method sets for a value type `T` versus a pointer type `*T`?

Accepted Answer

Value type T can only call value receiver methods; pointer type *T can call both value and pointer receiver methods

Answer

The method set of `T` includes only value receiver methods, while the method set of `*T` includes both value and pointer receiver methods.

Question 5

What is the purpose of using `new(T)` versus `&T{}` when creating a struct in Go?

Accepted Answer

Both allocate a zeroed struct and return a pointer; `&T{}` also lets you set initial field values

Answer

`new(T)` and `&T{}` both allocate a zeroed struct and return a pointer, but `&T{}` additionally allows specifying initial field values in the literal.

GO - Golang Online Test Practice Test

GO - Golang Online Test Practice Test

GO Structs and Methods 3