func main() {
words := []string{"doing", "go", "functional", "programming"}
numbers := []int{1, 2, 3}
fmt.Println("MAP")
fmt.Println("Square", numbers, f.Map(func(x int) int { return x * x }, numbers))
fmt.Println("Length", words, f.Map(func(x string) int { return len(x) }, words))
fmt.Println("Hash", words, f.Map(hash, words))
fmt.Println("REDUCE")
fmt.Println("Sum", numbers, f.Reduce(func(a int, x int) int { return a + x }, numbers, 0))
fmt.Println("Total length", words, f.Reduce(func(a int, x string) int { return a + len(x) }, words, 0))
fmt.Println("FILTER")
fmt.Println("Long words (>5)", words, f.Filter(func(x string) bool { return (len(x) > 5) }, words).([]string))
}
func pipeline(fs []BandFunc, bs []Band) []Band {
return f.DoMap(func(b Band) Band {
return f.Reduce(func(b Band, f BandFunc) Band {
return f(b)
}, fs, b).(Band)
}, bs).([]Band)
}
func main() {
people := []Person{Person{Name: "Mary", Height: 160}, Person{Name: "Isla", Height: 80}, Person{Name: "Sam"}}
fmt.Println("People", people)
knowingHeight := f.Filter(func(person Person) bool {
return (person.Height > 0)
}, people).([]Person)
fmt.Println("Knowing height people", knowingHeight)
average := f.Reduce(func(a float32, person Person) float32 {
return a + (float32(person.Height) / float32(len(knowingHeight)))
}, people, float32(0)).(float32)
fmt.Println("Average height among people we know their height: ", average)
}
func draw(r Race) {
drawing := f.Map(func(car Car) string {
return f.Reduce(func(a string, i int) string {
return a + "-"
}, make([]int, car.Position), "").(string)
}, r.Cars).([]string)
fmt.Println("............................")
f.Map(func(a string) interface{} {
fmt.Println(a)
return a
}, drawing)
}