Function composition with go

recompose.go

// https://go.dev/play/p/xmai9kPOwl3
// Function composition with go

// You can edit this code!
// Click here and start typing.
package main

func main() {
	example()
}

type composable = func() error

func compose(c []composable) error {
	for _, cf := range c {
		if err := cf(); err != nil {
			return err
		}
	}
	return nil
}

func example() error {
	a := 3

	inc := func() error {
		a = a + 1
		return nil
	}
	if err := compose([]composable{inc, inc, inc, func() error {
		a = a - 1
		return nil
	}}); err != nil {
		return err
	} else {
		println(a)
		return nil
	}
}