- ioutil - ioutil.ReadFile, ioutil.WriteFile
- os - os.Exit(1)
- strings - strings.Join([]string(d), ", "), strings.Split(string(bs), ", ")
- time - time.Now().UnixNano()
- rand -
- type - custom type
- struct is like object in js
- map looks like this [string]string
- interface make a new type
- for i := range d {}
- slice - []string