GO Structs and Methods

Question 1

How do you define a method on a struct type `Point` in Go?

Accepted Answer

func (p Point) Method() {}

Answer

In Go, methods are defined with a receiver between the `func` keyword and the method name, written as `func (p Point) Method() {}`.

Question 2

Which statement correctly initializes a struct `Person{Name string; Age int}` with named fields?

Accepted Answer

Person{Name: "Alice", Age: 30}

Answer

Go struct literals use the syntax `TypeName{Field: value}` with a colon between field name and value.

Question 3

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

Accepted Answer

A pointer receiver can modify the original struct; a value receiver operates on a copy

Answer

A pointer receiver (`*T`) allows the method to modify the underlying struct, while a value receiver (`T`) works on a copy and cannot affect the original.

Question 4

In Go, can a struct embed another struct? What is this feature called?

Accepted Answer

Yes, it is called struct embedding and promotes the embedded fields and methods

Answer

Go supports struct embedding, where an embedded type's fields and methods are promoted to the outer struct, enabling composition-based reuse.

Question 5

What does the following code print?
```go
type Rect struct{ W, H int }
func (r Rect) Area() int { return r.W * r.H }
fmt.Println(Rect{3, 4}.Area())
```

Accepted Answer

12

Answer

The `Area()` method multiplies `W` (3) by `H` (4), returning 12, which `fmt.Println` prints.

GO - Golang Online Test Practice Test

GO - Golang Online Test Practice Test

GO Structs and Methods