Accessing struct fields in Go - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a struct in Go?

A struct in Go is a collection of fields grouped together to form a single data type. It is used to represent a record or an object with multiple properties.

beginner

How do you access a field named Name in a struct variable person?

You access it using the dot notation: person.Name. This retrieves the value stored in the Name field of the person struct.

intermediate

Given a pointer to a struct p *Person, how do you access the Age field?

You can access it using p.Age. Go automatically dereferences the pointer when accessing fields, so you don't need to write (*p).Age.

beginner

What happens if you try to access a field that does not exist in a struct?

The Go compiler will give an error saying the field does not exist. You must only access fields defined in the struct type.

beginner

Why is using structs useful in Go programming?

Structs let you group related data together, making your code organized and easier to understand. They help model real-world objects with multiple properties.

How do you access the field Title of a struct variable book?

A book:Title

B book.Title

C book[Title]

D book->Title

In Go, struct fields are accessed using dot notation like book.Title.

If p is a pointer to a struct, which is correct to access field Age?

A p->Age

B *p.Age

C p.Age

D p[Age]

Go automatically dereferences pointers when accessing struct fields, so p.Age works.

What error occurs if you try to access a non-existent field in a struct?

A Compile-time error

B Runtime panic

C Silent failure

D Returns zero value

The Go compiler reports an error if you try to access a field not defined in the struct.

Which of these is a valid way to define a struct in Go?

A struct Person { Name string; Age int }

B class Person { Name string; Age int }

C Person = struct(Name string, Age int)

D type Person struct { Name string; Age int }

In Go, structs are defined using the syntax: type Name struct { fields }.

Why use structs in Go?

A To group related data together

B To perform arithmetic operations

C To create loops

D To handle errors

Structs group related data fields into one unit, modeling real-world objects.

Explain how to access fields in a Go struct and how pointers to structs affect this access.

Think about how you write <code>person.Name</code> and how Go lets you use <code>p.Age</code> if p is a pointer.

Describe what happens if you try to access a field that does not exist in a Go struct.

Remember Go checks field names when you compile your program.