Go language type Switch

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

Switch can also be used to determine the variable type. Use the method as T. (type), which is added after the variable. (type). See Code:

Package main Import ("FMT") Func main () {varAInterface{}a="ABC" SwitchT: =A. (type) { Case string: FMT. Printf ("string%s\n", T) Case int: FMT. Printf ("int%d\n", T)default: FMT. Printf ("Unexpected type%T", T)}}

The output is:

String ABC

If you put the above:

var a interface{}

A = "abc"

These two sentences, synthesize a sentence:

A: = "abc"

The compilation will go wrong:

Cannot type switch on Non-interface value A (type string)

You cannot use type switch on a variable of a non-interface type.

That is, type switch can only be used for interface variables.