Zero Values -

When a variable is declared and it isn’t assigned any value at the time of declaration, Go will assign a zero value to it based on it’s variable type.

Type of a variable decides what a zero value to it will take initially when declared (and if it isn’t assigned any value at the time of declaration).

// Zero Values assigned to variables by Go when they are declared and not assigned any values at the time of declaration.
var adiBool bool          // false
var adiInt int            // 0
var adiFloat float64      // 0
var adiStr string         // ""
var adiPointer *string    // nil | 'nil' means it doesn't point to any memory location

See also