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Accessing Struct Fields

Part of the Fundamentals section of Coddy's GO journey — lesson 96 of 109.

To access fields in a struct, use the dot notation (structVariable.fieldName).

Create a Person struct and access its fields:

type Person struct {
    name string
    age  int
}

func main() {
    person := Person{name: "Alice", age: 30}
    
    // Access individual fields
    fmt.Println(person.name)
    fmt.Println(person.age)
}

The output shows the individual field values:

Alice
30

You can also modify field values using the same dot notation:

person.age = 31
fmt.Println(person.age)  // Prints: 31

Challenge

Easy

In this challenge, you'll practice accessing fields from a struct. We've defined a Person struct with name, age, and isStudent fields.

Your task is to access these fields and print them using the correct format verbs.

Try it yourself

package main

import "fmt"

func main() {
	// Person struct with three fields
	type Person struct {
		name      string
		age       int
		isStudent bool
	}

	// A sample person
	john := Person{
		name:      "John Doe",
		age:       25,
		isStudent: true,
	}

	// TODO: Print john's name using fmt.Printf and the %s format verb
	fmt.Printf("Name: %s\n", ?)
	
	// TODO: Print john's age using fmt.Printf and the %d format verb
	fmt.Printf("Age: %d\n", ?)
	
	// TODO: Print whether john is a student using fmt.Printf and the %t format verb
	fmt.Printf("Is student: %t\n", ?)
	
}

Test yourself

This lesson includes a short quiz. Start the lesson to answer it and track your progress.

All lessons in Fundamentals

1Introduction to Go

What is Go?Hello World Println Go Comments

4Comparison & Logical Operators

Comparison Operators - Part 1 Comparison Operators - Part 2 Logical AND Operator Logical OR Operator Logical NOT Operator Operator Precedence Basics Recap - Making Comparisons

7Control Flow: Loops

What The `for` Loop Explained For Loop - Basic For Loop - Condition Only The `break` Keyword The `continue` Keyword Nested Loops Recap - Repeating Actions

10Composite Types: Arrays

Introduction to Arrays Declaring Arrays Initializing Arrays Accessing Array Elements Array Length with `len`Iterating Over Arrays Multi-dimensional Arrays

13Composite Types: Structs

Defining Custom Types Creating Struct InstancesAccessing Struct FieldsPointers to Structs Initializing Structs Embedded Structs Anonymous Structs Recap - Custom Data Structures

2Variables and Basic Data Types

What is a variable Type Inference with `:=`Integers (int)Floating-Point Numbers Booleans Strings Zero Values Constants Naming Conventions Recap - Variables and Types

5Basic Input/Output

Formatted Output Format Verbs Printing Types Getting Basic User Input Recap - Input and Output

8Functions

Understanding Functions Declaring a Function Calling Functions Function Parameters Returning a Single Value Returning Multiple Values Named Return Values Function Scope Basics Recap - Creating Reusable Code

11Composite Types: Slices

Introduction to Slices Declaring Slice Literals Creating Slices with `make`Slice Length vs Capacity Accessing Slice Elements Appending Elements Slicing Existing Slices/Arrays Iterating Over Slices Copying Slices Recap - Dynamic Lists

14Basic Error Handling

The Concept of Errors The `error` Interface Functions Returning Errors Checking for Errors Creating Simple Errors Creating Formatted Errors Basic Error Handling Recap - Handling Problems