Go toolchain overview - Mini Project: Build & Apply

Go toolchain overview

📖 Scenario: You are learning how to use the Go programming language tools to build and run a simple program.

🎯 Goal: Build a small Go program, set up a variable, write a function, and use the Go toolchain commands to compile and run the program.

📋 What You'll Learn

Create a Go source file with a main package

Declare a variable with a specific value

Write a function that returns a greeting string

Call the function and print the result

Use the Go toolchain commands to build and run the program

💡 Why This Matters

🌍 Real World

Go is used to build fast and reliable software like web servers, tools, and cloud services. Knowing the Go toolchain helps you develop and run Go programs efficiently.

💼 Career

Many software jobs require knowledge of Go and its toolchain for building backend services, command-line tools, and cloud applications.

1

Create the main package and declare a variable

Create a Go source file with package main and declare a variable called name with the value "Go Learner".

Go

package main

// Declare a variable called name with value "Go Learner"
// Your code here

Need a hint?

Start with package main at the top. Then declare var name = "Go Learner".

2

Write a function that returns a greeting

Add a function called greet that returns a string greeting using the name variable.

Go

package main

var name = "Go Learner"

// Write a function greet() that returns "Hello, " + name
// Your code here

Need a hint?

Define func greet() string and return the greeting by joining "Hello, " and name.

3

Call the function and print the greeting

Add a main function that calls greet() and prints the returned greeting using fmt.Println. Import the fmt package.

Go

package main

import "fmt"

var name = "Go Learner"

func greet() string {
    return "Hello, " + name
}

// Add main() function to print greet() result
// Your code here

Need a hint?

Import fmt. Then write func main() that calls fmt.Println(greet()).

4

Run the program using Go toolchain

Run the program using the Go toolchain command go run to display the greeting message.

Go

package main

import "fmt"

var name = "Go Learner"

func greet() string {
    return "Hello, " + name
}

func main() {
    fmt.Println(greet())
}

// Run the program with `go run` command in terminal

Need a hint?

Use the terminal command go run filename.go to run your program and see the output.