Golang : How to check for empty array string or string?

Sometimes that most obvious thing can be the hardest to remember. Putting this down as a note for myself and maybe useful to you too.

Problem :

Need to check if a string or []string is empty. How to do that?

Solutions :

if str is a string

 len(strings.TrimSpace(str)) == 0

and let say str is an array []string

 var str []string
 strings.TrimSpace(strings.Join(str, "")) == ""

Reference :

https://groups.google.com/forum/#!topic/golang-nuts/7Ks1iq2s7FA