Golang underline (underscore) summary

This is a creation in Article, where the information may have evolved or changed.

I. Overview

"_" can be simply understood as the assignment but no longer used, in the Golang used more, the use of a lot of occasions, a little summary;

Second, the scene

1. Import

1 Import  "net/http/pprof"

The introduction of the package invokes the initialization function in the package, which only initializes the imported package and does not apply to other features in the package;

2, used in the return value

1  for _, V: = range Slice {}2 _, Err: = Func ()

Indicates that a value is ignored. A single function has multiple return values that are used to obtain a specific value

3. Use in variable

1 Interface {23} 4 5 struct {67} 8 9 var _ Interface = &t{}

The above is used to determine whether type T implements I, as a type assertion, and if T does not implement the excuse I, then the compilation error.

Example:

1 Package Main2 3Import"FMT"4 5Type InterfaceInterface {6 Stop ()7 }8 9Type BMWstruct {TenNamestring One } A  -Func ( This*BMW) Stop () { -Fmt. Printf ("%s BMW stop.\n", This. Name) the } -  -Type Carstruct { - Interface + } -  + Func Main () { Ac: =car{ at&bmw{ -Name:"X5", -         }, -     } - c.stop () -}