How to pass a function as parameter in Go?

Question

Does Go have something that can facilitate a function/callback being passed in as a parameter?

Gopher · Accepted Answer

Yes, consider some of these examples: package main import "fmt" // convert types take an int and return a string value. type convert func(int) string // value implements convert, returning x as string. func value(x int) string { return fmt.Sprintf("%v", x) } // quote123 passes 123 to convert func and returns quoted string. func quote123(fn convert) string { return fmt.Sprintf("%q", fn(123)) } func main() { var result string result = value(123) fmt.Println(result) // Output: 123 result = quote123(value) fmt.Println(result) // Output: "123" result = quote123(func(x int) string { return fmt.Sprintf("%b", x) }) fmt.Println(result) // Output: "1111011" foo := func(x int) string { return "foo" } result = quote123(foo) fmt.Println(result) // Output: "foo" _ = convert(foo) // confirm foo satisfies convert at runtime // fails due to argument type // _ = convert(func(x float64) string { return "" }) } Play: http://play.golang.org/p/XNMtrDUDS0 Tour: https://tour.golang.org/moretypes/25 (Function Closures)

Go Language

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