declarative function composition - golang

gistfile1.go

package main

import "fmt"

type F func(i int) int

func (f F) compose(inner F) F {
	return func(i int) int { return f(inner(i)) }
}

func main() {
	var f1 F = func(i int) int {
		return i * 2
	}

	var f2 F = func(i int) int {
		return i + 1
	}

	var f3 F = func(i int) int {
		return i + 10
	}

	f := f1.compose(f2).compose(f3)


	fmt.Println(f(2))
	fmt.Println("end")
}

Searching exactly this, thanks for sharing.