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package main

import "fmt"
import "strings"


type ArrayList struct {
	array []string
}

func (a* ArrayList) Add(s string) {
	a.array = append(a.array, s)
}
func (a* ArrayList) Get(i int) string {
	return a.array[i]
}

func (a* ArrayList) Size() int {
	return len(a.array)
}


func (a ArrayList) filter(f func(x string) bool) ArrayList {
	var aList ArrayList
	for i:= 0; i < a.Size(); i++ {
		if f(a.Get(i)) {
			aList.Add(a.Get(i))
		}
	}
	return aList
}

type Function struct {
}

func (function Function) Equals(value string) func(s string) bool {
	return func (s string) bool{
		return s  == value
	}
}

func (function Function) Contains(value string) func(s string) bool {
	return func (s string) bool {
		return strings.Contains(s, value)
	}
}



func main() {
	fmt.Println("hi")
	var a ArrayList
	a.Add("what")
	a.Add("yo")
	a.Add("5")

	var function Function

	k := a.filter(function.Equals("what")).filter(function.Contains("hat"))

	fmt.Println(k .Size())
}