tour.golang.go

package main

import "fmt"

func fmap( f (func(int) int), a []int) []int {
    for i:= range a {
        a[i] = f(a[i])
    }
    return a
}

// Doing fold with map
func adder() func(int) int {
    sum := 0
    return func(x int) int {
        sum += x
        return sum
    }
}


func main() {
    //pos, neg := adder(), adder()
    weights := []int{1,2,3,4,5}
    /*
    for i := 0; i < 10; i++ {
        fmt.Println(
            pos(i),
            neg(-2*i),
        )
    }*/
    a := fmap(adder(),weights)
    for i:= range a {
        fmt.Println(a[i])
    }
}

package main

import "fmt"

// fibonacci is a function that returns
// a function that returns an int.
// 1 1 2 3 5 8 13 21
func fibonacci() func() int {
    f1 := 1
    f2:= 0
    res :=0
    return func() int {
        res = f1 + f2
        f2 = f1
        f1 = res
        return res
    }
}

func main() {
    f := fibonacci()
    for i := 0; i < 10; i++ {
        fmt.Println(f())
    }
}