Learning Functional Programming in Go

Extending our currying example

But wait, there's more! Let's add the following, just above func main():

func (f numberIs) apply(s ...int) (ret []bool) {   for _, i := range s {      ret = append(ret, f(i))   }   return ret}

The apply function is a method bound to a function type, namely numberIs. Our apply function applies the numberIs function to each argument. Each calculated value is appended to the newly created array of bools that is then returned to the caller.

Next, we update main() as follows:

func main() {   fmt.Println("NonCurried - lessThan(1,2):", lessThan(1,2))   fmt.Println("Curried - LessThanTwo(1):", lessThanTwo(1))   // use anonymous function   isLessThanOne := numberIs(func(i int) bool { return i < 1 }).apply    isLessThanTwo := numberIs(lessThanTwo).apply ...