Zero Values
Variables declared without an explicit initial value are given their zero value.
The zero value is:
0for numeric types,falsefor the boolean type, and""(the empty string) for strings.nilfor slice
s := ""
s := make([]string, 3) //[ ]
var s string
var s = ""
var s string = ""All Types
bool
string
int int8 int16 int32 int64
uint uint8 uint16 uint32 uint64 uintptr
byte // alias for uint8
rune // alias for int32
// represents a Unicode code point
float32 float64
complex64 complex128