1 / 17

Learn Go from Scratch

Hello! Welcome

Today we are going to learn about Go (Golang) from Scratch

What is Go?

Go is a programming language developed by Google, designed to be fast, safe, and simple.

With Go, you can create applications for the web, servers, and much more!

Why use Go?

Go is ideal for applications that require concurrency and high performance in large-scale networks and systems.

Additionally, its simplicity and compilation speed make Go perfect for server development and distributed applications.

You write your code in Go using a text editor, compile it, and Go turns it into a program that you can run.

You’re doing great!

Now let’s talk about the syntax of Go

Variables in Go

Variables in Go store data that your program needs. You can create variables for numbers, texts, booleans…

var x int = 5
y := 10 // quick declaration and assignment
sum := 5 + 10

With them, you can perform arithmetic, logical, and comparison operations.

Conditionals

With conditionals, you can make the program make decisions. We use if and else to execute code only if a condition is true.

For example:

if x > 5 {
    fmt.Println("It is greater than 5")
}

Loops

Loops allow us to repeat actions. We use for to repeat actions.

For example:

for i := 0; i < 5; i++ {
    fmt.Println(i)
}

Functions in Go

Functions are blocks of code that perform specific tasks.

func sum(a int, b int) int {
    return a + b
}

You can use functions to break your code into more manageable parts.

Arrays and Collections

Collections are structures that allow you to store multiple values. The simplest is an array.

var arr [5]int
slice := []int{1, 2, 3}

We also have slices, which are more flexible because they can change size dynamically.

Structures in Go

Structures are a way to group related data. With them, you can create custom data types for your program.

type Person struct {
    Name  string
    Age   int
}

They are useful for modeling entities with multiple properties.

Error Handling

Go has a simple approach to error handling, which helps you find and fix problems in your code.

result, err := functionThatCanFail()
if err != nil {
    // handle the error
}

Concurrency in Go

Go makes concurrency easy, with goroutines and channels, ideal for simultaneous tasks.

go function()

Each goroutine runs in parallel, optimizing performance.

You’re almost there!

We just need to see how to create a project in Go.

Create a Project

A good first project in Go is to write a program that displays a message on the screen.

Create a folder for your project.
Run go mod init project_name to initialize the module.

This sets up the project and manages dependencies.

Write Your First Program

Create a file main.go and write your first program:

package main

import "fmt"

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

Compile and Run

Once your code is ready, compile it with Go and run the program to see the result.

go run main.go

Go will execute your code immediately.

Well done!

Now you know the basics of Go! Keep exploring and creating with this amazing language!

Previous Next

See all 'from scracth'