Golang Interface Notes

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

First, the concept

Interface types are abstractions and generalizations of other types of behavior, because interface types are not tied to specific implementation details, and in this abstract way we can make our functions more flexible and adaptable.

The uniqueness of the interface type in the go language is that it satisfies the implicit implementation. In other words, it is not necessary to define all the satisfied interface types for a given specific type; it is sufficient to simply have some necessary methods.

This design allows you to create a new interface type that satisfies a specific type that already exists but does not change the definition of those types, which is especially useful when the type we use comes from a package that is not under our control.

Second, the Declaration and use of the interface

Package Mainimport ("FMT") Type IcaleInterface{Sum (A, Bint)int}type Computerstruct{}func ( This*computer) Sum (A, Bint)int {    returnA +B}func ( This*computer) Print ()int{fmt. Println ("AI")}func Main () {FMT. Println (New(computer). Sum (1,2))    varIcale Icale =New(computer) fmt. Println (Icale. Sum (2,3))}

Three, NULL interface type: There is no requirement to implement its type, so we can assign any value to the Null interface type

Package Mainimport ("FMT") Func main () {varVInterface{} v=1FMT. Println (v) v="123"FMT. Println (v) v=trueFMT. Println (v) v= map[string]int{" One":1} fmt. Println (v)}

Package Mainimport ("FMT") Func main () {print (map[string]int{" One":1}) Print (func ()int{return 1}) Print (func ()int{return 1} ())}func print (ValInterface{}) {Fmt. Println (val)}