Basic Golang setup.

• Best way to install go in Mac is download official dmg file and install.
• Check that Go is installed correctly by setting up a workspace and building a simple ‘hello world’ program.
• Create a workspace directory for go project. set the GOPATH environment variable to point to that location. mkdir go_work and export GOPATH=$HOME/go_work
• Next, make the directories src/github.com/user/hello inside your workspace
• Inside the hello directory create a file named hello.go with the following contents:

    package main

    import "fmt"

    func main() {
        fmt.Printf("hello, world\n")
    }

• Then compile with go install github.com/user/hello. This will create an executable file hello under bin directory of workspace.
• Next, command to execute hello

   $ $GOPATH/bin/hello
   hello, world