Type inference in Go - Mini Project: Build & Apply

Type inference in Go

📖 Scenario: You are creating a simple Go program to store and display information about a book. You will use Go's type inference feature to declare variables without explicitly stating their types.

🎯 Goal: Build a Go program that uses type inference to declare variables for a book's title, author, and number of pages, then prints these details.

📋 What You'll Learn

Declare variables using type inference with the := operator

Use string values for title and author

Use an integer value for pages

Print the book details using fmt.Println

💡 Why This Matters

🌍 Real World

Type inference helps write cleaner and shorter Go code, especially when variable types are obvious from the assigned values.

💼 Career

Understanding type inference is important for Go developers to write idiomatic and efficient code in real-world applications.

1

Create variables with type inference

Use Go's type inference to declare a variable called title with the value "The Go Programming Language".

Go

// Use type inference to declare 'title' with value "The Go Programming Language"
// Your code here

Need a hint?

Use the := operator to let Go infer the type automatically.

2

Add more variables with type inference

Add two more variables using type inference: author with value "Alan A. A. Donovan" and pages with value 380.

Go

package main

func main() {
    title := "The Go Programming Language"
    // Declare 'author' with value "Alan A. A. Donovan"
    // Declare 'pages' with value 380
    // Your code here
}

Need a hint?

Use := for both variables to let Go infer their types.

3

Use variables in a print statement

Import the fmt package and use fmt.Println to print the variables title, author, and pages in one line.

Go

package main

import "fmt"

func main() {
    title := "The Go Programming Language"
    author := "Alan A. A. Donovan"
    pages := 380
    // Print title, author, and pages using fmt.Println
    // Your code here
}

Need a hint?

Remember to import fmt at the top and use fmt.Println inside main.

4

Run the program to see the output

Run the program and print the output. The output should show the book title, author, and number of pages separated by spaces.

Go

package main

import "fmt"

func main() {
    title := "The Go Programming Language"
    author := "Alan A. A. Donovan"
    pages := 380
    fmt.Println(title, author, pages)
    // Your code here
}

Need a hint?

Run the program using go run and check the output matches exactly.