Hello World Go Lang. Youtube https://www.youtube.com/watch?v=XCsL89YtqCs Docs https://golang.org/doc/code.html

.profile

#WorkSpace
export GOPATH=$HOME/work
#Binaries produced by GO 
export PATH=$PATH:$GOPATH/bin

directoryTree.txt

├── bin
│   └── hello
├── pkg
│   └── darwin_amd64
│       └── github.com
│           └── phpdave
│               └── string.a
└── src
    └── github.com
        └── phpdave
            ├── hello
            │   └── hello.go
            └── string
                ├── string.go
                └── string_test.go

hello.go

package main

import (
  "fmt"
  "github.com/phpdave/string"
)
func main() {
    fmt.Printf(string.Reverse("\nHello I'm writing some go code\n"))
}

string.go

package string

func Reverse(s string) string{
  //b:= []bytes(s)
 
  //rune(s) used instead of byte(s) so UTF 8 characters work properly
  b:= []rune(s)
  for i := 0 ; i < len(b)/2; i++{
    j:= len(b)-i-1
    b[i], b[j] = b[j], b[i]
  }
  return string(b)
}

string_test.go

package string

import "testing"

func Test(t *testing.T) {
	var tests = []struct {
  		s, want string
	}{
      		{"Backward","drawkcaB"},
      		{"Hello You!", "!uoY olleH"},
          {"Hi क़","क़ iH"},
	}
	for _, c := range tests {
    		got := Reverse(c.s)
		if got != c.want {
			t.Errorf("Reverse(%q) == %q, want %q", c.s, got, c.want)
		}
	}
}