Functional programming in go

funcProgramming.go

package main

import "fmt"

type predicate func(int) bool

func main() {
	r := filter([]int{1, 2, 3, 4}, func(x int) bool {
		return x%2 == 0
	})
	fmt.Println(r)
	
	r = filter([]int{1, 2, 3, 4}, func(x int) bool {
		return x%2 != 0
	})
	fmt.Println(r)
}

func filter(arr []int, f predicate) []int {
	newArr := []int{}
	for _, value := range arr {
		if f(value) {
			newArr = append(newArr, value)
		}
	}
	return newArr
}