Lazy streams for Go, but bad.

Apparently someone said somewhere that not allowing a method to declare new type parameters will stop people from creating bad code, like porting the Java Stream API to Go.

Unfortunately this is not the case as proved by this abomination.

Make it possible to define and compose operations on lazy streams.

• The order of the operation definitions should match the application order, e.g. chain(first, second)(stream) instead of second(first(stream)).
• No public function or type refers to interface{}.

This code should print 2, 4.

package main

import (
    "fmt"
	"strconv"

	p "github.com/vilppuvuorinen/pipes"
)

func main() {
    stream := p.OfSlice([]int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10})

	result := p.Join(
		p.Compose(
			p.Chain(
				p.Filter(func(i int) bool { return i%2 == 0 }),
				p.TakeN[int](2),
			),
			p.Map(func(i int) string {
				return strconv.Itoa(i)
			}),
		)(stream),
		", ",
	)

    fmt.Printf("%s", result)
}

See tests for further examples.