LECTURE.md

Lesson 1: Intro

• Lesson 1: Intro
  • History
  • Pros and cons
    • Pros
    • Cons
  • Practice
    • Hello World
  • Exercises
    • Exercise 1
    • Exercise 2

History

Pros and cons

Pros

• Fast
• Easy To Learn
• Well-Scaled
• Comprehensive

Cons

• Time Consuming
• Less Features
• Binaries can be large

Practice

$ go version
go version go1.22.5 darwin/arm64

Hello World

$ mkdir example1 && cd example1

$ go mod init github.com/talgat-ruby/lessons-go/lesson1/example1

$ touch main.go

// main.go

package main

import "fmt"

func main() {
	fmt.Println("Hello, World!")
}

Let's run the program

$ go run ./...
Hello, World!

Let's build the program and run binary file

$ go build ./... -o hello_world
$ ./hello_world

Exercises

Exercise 1

Build the hello_world, but now it will print your name instead of World

$ go run ./...
Hello, Talgat!

Exercise 2

Use the code from exercise 1. And print number of time supplied from the cli argument. Default is 1.

$ go run ./... 3
Hello, Talgat!
Hello, Talgat!
Hello, Talgat!