Go common judgments

var str string The string is initialized to "" Only through len(str) Not through nil Judge
var i int    int Initialize to 0  , Only through i == 0, Not through nil Judge
var b bool   Initialize to false, Only through b == true , Not through nil Judge
 var bb []byte Initialize to [], It can be used len(bb) or bb == nil , Not through bb == "" Judge
var c [1] int Initialize to [0] Filled with default values 0, It can be used len(c) or cap(c), But can't use c== nil perhaps c = "" Judge
var d []string Initialize to [], It can be used d == nil || len(d) > 0 || cap(len) > 0 , But can't use d == "" Judge
var e map[string]int Initialize to [], It can be used e == nil || len(e) > 0 , But can't use e == "" Judge
var f interface{}   Initialize to nil, It can be used f == nil , But can't use f=="" ||len(f) > 0 Judge
var g chan string Initialize to nil, It can be used g == nil ||len(g) > 0 || cap(g) > 0 , But can't use g == "" Judge
var h *string Initialize to nil, Only use h == nil Judge
nil Types of support
var nil Type // Type must be a pointer, channel, func, interface, map, or slice type
struct{} This cannot be judged by the above