cleanup.go

package main

import (
	"fmt"
	"reflect"
)

func clean(slice interface{}, isDead func(int) bool) int {
	rv := reflect.ValueOf(slice)
	swap := reflect.Swapper(slice)
	length := rv.Len()
	n := 0
	for i := 0; i < length; i++ {
		if !isDead(i) {
			swap(n, i)
			n++
		}
	}
	return n
}

func main() {
	slice := []int{
		1, 1, 0, 1, 1, 0, 0,
	}

	n := clean(slice, func(i int) bool { return slice[i] == 0 })
	slice = slice[:n]
	fmt.Println(slice)
}