Each type in Go has a zero value, which is the default value assigned to a variable of that type when it is declared but not explicity initialized.

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var boolean bool // false
var integer int // 0
var float float64 // 0.0
var complex complex128 // (0+0i)
var str string // ""
var array [5]int // [0 0 0 0 0]
var slice []int // nil
var mapVar map[string]int // nil
var channelVar chan int // nil
var pointer *int // nil
var functionVar func() // nil
var interfaceVar interface{} // nil