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The Ultimate Guide to Downloading Go 1.20.1 and Setting Up Your Environment


Introduction




Go is a programming language that is open source and designed to make programmers more productive. It was created at Google in 2009 by Robert Griesemer, Rob Pike, and Ken Thompson, who wanted a language that was fast, simple, reliable, and scalable. Some of the key features of Go include:


  • Support for environment adopting patterns similar to dynamic languages



  • Fast compilation time



  • Inbuilt concurrency support: lightweight processes (via goroutines), channels, select statement



  • Simplicity



  • Powerful standard library



  • Testing support



  • Powerful compiler



  • Go binaries



Go has been used by many organizations in every industry to power their software and services. Some examples of famous projects that use Go are Docker, Kubernetes, Terraform, Hugo, and gRPC. You can find more stories of companies using Go .




download go 1.20.1



Download and install Go




To compile and run a simple program in Go, you need to download and install the latest version of Go from the . The installation process is different for different operating systems. Here are the steps for Linux, Mac, and Windows:


Linux




  • Remove any previous Go installation by deleting the /usr/local/go folder (if it exists), then extract the archive you just downloaded into /usr/local, creating a fresh Go tree in /usr/local/go:$ rm -rf /usr/local/go && tar -C /usr/local -xzf go1.20.4.linux-amd64.tar.gz(You may need to run the command as root or through sudo).



  • Add /usr/local/go/bin to the PATH environment variable. You can do this by adding the following line to your $HOME/.profile or /etc/profile (for a system-wide installation):export PATH=$PATH:/usr/local/go/binNote: Changes made to a profile file may not apply until the next time you log into your computer. To apply the changes immediately, just run the shell commands directly or execute them from the profile using a command such as source $HOME/.profile.



  • Verify that you've installed Go by opening a command prompt and typing the following command:$ go versionConfirm that the command prints the installed version of Go.



Mac




  • Open the package file you downloaded and follow the prompts to install Go.The package installs the Go distribution in /usr/local/go. The package should put the /usr/local/go/bin directory in your PATH environment variable. You may need to restart any open Terminal sessions for the change to take effect.



  • Verify that you've installed Go by opening a terminal and typing the following command:$ go versionConfirm that the command prints the installed version of Go.



Windows




  • Open the MSI file you downloaded and follow the prompts to install Go.The installer should put the C:\Go\bin directory in your PATH environment variable. You may need to restart any open command prompts for the change to take effect.



  • Verify that you've installed Go by opening a command prompt and typing the following command:C:\> go versionConfirm that the command prints the installed version of Go.



Write some code in Go




Now that you have Go installed, you can write some code in Go. Go programs are organized into packages, which are collections of source files that share a common namespace and a set of dependencies. A package can be executable or a library. An executable package must have a file called main.go that defines a function called main(), which is the entry point of the program. A library package can be imported by other packages to use its exported identifiers, such as types, variables, constants, and functions.


Hello, world!




Let's start with a simple program that prints "Hello, world!" to the standard output. Create a folder called hello and inside it create a file called main.go. Then write the following code in the file:


How to download and install go 1.20.1 on Windows


Download go 1.20.1 source code and build from scratch


Go 1.20.1 release notes and new features


Download go 1.20.1 for Linux and Mac OS


Go 1.20.1 installation instructions and troubleshooting


Download go 1.20.1 for FreeBSD, Linux ppc64le, and Linux s390x


Go 1.20.1 binary distributions and checksums


Download go 1.20.1 for ARM64 and x86-64 processors


Go 1.20.1 module mirror and checksum database


Download go 1.20.1 for web development and cloud computing


Go 1.20.1 documentation and tutorials


Download go 1.20.1 for data science and machine learning


Go 1.20.1 performance improvements and benchmarks


Download go 1.20.1 for mobile development and cross-platform apps


Go 1.20.1 compatibility and migration guide


Download go 1.20.4, the latest stable version of go


Go 1.20.4 vs go 1.20.3 vs go 1.20.2 vs go 1.20.1 comparison


Download go 2, the upcoming major version of go


Go 2 features and roadmap


Download go playground, an online tool to run go code


Go playground examples and tips


Download go tools, a collection of tools for working with go code


Go tools usage and best practices


Download go packages, a repository of reusable go code


Go packages overview and search


Download go vet, a tool to check the correctness of go code


Go vet errors and warnings


Download go fmt, a tool to format go code according to the official style guide


Go fmt options and flags


Download go test, a tool to run automated tests for go code


Go test coverage and reports


Download go mod, a tool to manage dependencies for go modules


Go mod commands and configuration


Download go run, a tool to compile and run go code without building an executable file


Go run arguments and environment variables


Download golang.org/x, a subrepository of experimental and deprecated packages for go


Golang.org/x packages list and status


Download gopls, a language server for go that provides IDE features such as code completion, diagnostics, formatting, etc.


Gopls installation and integration with editors


Download gopherjs, a compiler that transpiles go code to JavaScript code that can run in the browser


Gopherjs examples and limitations


Download gomobile, a tool that enables cross-platform mobile development with go


Gomobile bind and init commands


Download gophercises, a series of exercises that help you learn go by building real-world applications


Gophercises solutions and feedback


Download gotour, an interactive introduction to the go programming language


Gotour slides and exercises


package main import "fmt" func main() fmt.Println("Hello, world!")


The first line of the code declares the package name, which is main in this case. The second line imports the fmt package from the standard library, which provides formatted I/O functions. The third line defines the main() function, which prints "Hello, world!" using the fmt.Println() function.


To run the program, open a terminal or command prompt and navigate to the hello folder. Then type the following command:


$ go run main.go


You should see the output "Hello, world!" on your screen.


Call code in an external package




You can use code from other packages by importing them in your program. For example, you can use the package to generate random numbers. Let's modify our program to print a random number between 1 and 10 instead of "Hello, world!". Edit your main.go file and change it to:


package main import ( "fmt" "math/rand" "time" ) func main() // Seed the random number generator with the current time rand.Seed(time.Now().UnixNano()) // Generate a random number between 1 and 10 n := rand.Intn(10) + 1 // Print the number fmt.Println(n)


The first line of the code is unchanged, it still declares the package name as main. The second line imports three packages: . We use parentheses to group multiple imports into one statement. The third line defines the main() function, which does three things:


  • It calls the , which returns the current time in nanoseconds. This is necessary to initialize the random number generator with a different seed every time we run the program, otherwise we would get the same sequence of random numbers every time.



  • It calls the function with the argument 10, which returns a random integer between 0 and 9. We add 1 to this result to get a number between 1 and 10.



  • It calls the function with the argument n, which prints the number to the standard output.



To run the program, open a terminal or command prompt and navigate to the hello folder. Then type the same command as before:


$ go run main.go


You should see a random number between 1 and 10 on your screen. Try running the program multiple times and see how the output changes.


Write more code in Go




Now that you know how to write and run a simple program in Go, let's write some more code in Go. Go has many features and constructs that make it easy and fun to write code. Some of them are:


Data types: Go has basic data types such as numbers, strings, booleans, and arrays, as well as composite data types such


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