Default zero values for all Go types

3 years ago

source link: https://yourbasic.org/golang/default-zero-value/
Go to the source link to view the article. You can view the picture content, updated content and better typesetting reading experience. If the link is broken, please click the button below to view the snapshot at that time.

Default zero values for all Go types

yourbasic.org/golang

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>}]

Default zero values for all Go types

Default zero values for all Go types

Further reading

Recommend

How to use the copy function

How to append anything (element, slice or string) to a slice

Make slices, maps and channels

Untyped numeric constants with no limits

Type assertions and type switches

Defer a function call (with return value)

4 basic range loop (for-each) patterns

2 patterns for a do-while loop in Go

4 basic if-else statement patterns

Package initialization and program execution order

About Joyk