Default zero values for all Go types

Variables declared without an initial value are set to their zero values:

• 0 for all integer types,
• 0.0 for floating point numbers,
• false for booleans,
• "" for strings,
• nil for interfaces, slices, channels, maps, pointers and functions.

The elements of an array or struct will have its fields zeroed if no value is specified. This initialization is done recursively:

type T struct {
	n int
	f float64
	next *T
}
fmt.Println([2]T{}) // [{0 0 <nil>} {0 0 <nil>}]

Further reading

Struct initialization code example