go get github.com/swdyh/go-enumerable/src/enumerable

package main

import (
	"fmt"
	"github.com/swdyh/go-enumerable/src/enumerable"
	"io/ioutil"
	"net/http"
)

func main() {

	// map for slice
	var twiceInt func([]int) []int
	enumerable.MakeMap(&twiceInt, func(i int) int { return i * 2 })
	fmt.Println(twiceInt([]int{1, 2, 3})) // [2 4 6]

	// type error
	var twiceIntWrongType func([]int) []int
	err := enumerable.MakeMap(&twiceIntWrongType, func(i int) string { return fmt.Sprintf("%d", i*2) })
	fmt.Println(err) // TypeError: int != string
         
	// filter for slice
	var filterOdd func([]int) []int
	enumerable.MakeFilter(&filterOdd, func(i int) bool { return i%2 == 1 })
	fmt.Println(filterOdd([]int{1, 2, 3})) // [1 3]

	// map for slice (concurrnt)
	urls := []string{
		"http://www.google.co.jp",
		"http://www.yahoo.co.jp"}
	var getAll func([]string) []string
	enumerable.MakeMapC(&getAll, func(url string) string {
		res, _ := http.Get(url)
		b, _ := ioutil.ReadAll(res.Body)
		return res.Status + " " + string(b)[0:50]
	}, 2)
	for _, v := range getAll(urls) {
		fmt.Println(v)
	}

	// get first result (concurrnt)
	var getFirst func([]string) string
	enumerable.MakeFirst(&getFirst, func(url string) string {
		res, _ := http.Get(url)
		b, _ := ioutil.ReadAll(res.Body)
		return url + " " + res.Status + " " + string(b)[0:50]
	})
	fmt.Println(getFirst(urls))
}