Go Tutorial - Hello World App

This is a quick tutorial on getting started with Golang. In this tutorial, we will see how to build a simple Hello World go app step by step.

Check out 50+ Golang source code examples at https://www.sourcecodeexamples.net/p/golang-source-code-examples.html

Installation

We can go to https://golang.org/dl/ and download the binary depending on our Operating System and install it. Once installed run go version and you should be able to see the go version.

$ go versiongo version go1.14.1 darwin/amd64$

Once go is installed set GOPATH environment variable. On MacOS by default, it is set to ${user.home}/go. We can also add $GOPATH/bin to our PATH.

$export GOPATH=~/go$export PATH=$PATH:$GOPATH/bin

Quickstart

Create New Project

Create a new project directory hello-go and cd into the directory:

$ mkdir hello-go&cd hello-go

In the hello-go directory create hello.go file with the following content:

hello.go

package mainimport"fmt"funcmain() {fmt.Println("Hello World!!!")}

Now you can run the application using go run hello.go and build the application as executable binary using go build as follows:

hello-go> go run hello.goHello World!!!hello-go> go buildhello-go> lshello hello.gohello-go> ./helloHello World!!!

We can install 3rd-party dependencies using go get command as follows:

hello-go> go get -u github.com/mitchellh/go-homedirhello-go> cat go.modmodule github.com/sivaprasadreddy/hello-gogo 1.14require github.com/mitchellh/go-homedir v1.1.0 // indirecthello-go>

We can use homedir module as follows:

hello.go

package mainimport ("fmt""github.com/mitchellh/go-homedir""os")funcmain()  {fmt.Println("Hello World!!!")home,err:=homedir.Dir()iferr!=nil {fmt.Println("Error: ",err)os.Exit(1)}fmt.Println("My Home directory: ",home)}
Check out 50+ Golang source code examples at https://www.sourcecodeexamples.net/p/golang-source-code-examples.html

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