Something like Reduce, Map, and Collect in Go

main.go

package main

import (
	"fmt"
	"strconv"
)

type Power struct {
	up int
}

func main() {
	s := []int{2, 3, 5, 7, 11, 13}
	fmt.Println("s ==", s)

	// Filter
	cs := func (nums []int) []int {
		dest := make([]int, 0)
		for _, v := range nums {
			if v > 3 && v < 13 {
				dest = append(dest, v)
			}
		}
		return dest
	}(s[0:])

	// Map
	ms := func (y []int) []Power {
		dest := make([]Power, 0)
		for _, v := range y {
			dest = append(dest, Power{v})
		}
		return dest
	}(cs[0:])

	// Collect
	res := func (x []Power) string {
		powers := "The powers: "
		pow := 0

		for _, v := range x {
			pow += v.up
		}

		return powers + strconv.Itoa(pow)
	}(ms[0:])

	fmt.Println(res)
}