Experiments with golang reflection. Create an empty slice of the type passed in in a callback: https://play.golang.org/p/Zc9HiABuMi_a

reflection_intro.go

package main

import (
	"fmt"
	"reflect"
)

func main() {
	callback := func(int) bool { return false }
	
	ref := reflect.ValueOf(callback)
	fmt.Println("callback", ref.Type())
	
	requested := ref.Type().In(0)
	fmt.Println("first parameter type", requested)
	
	v := reflect.Zero(requested)
	fmt.Println("zero value:", v)
	
	slice := reflect.Zero(reflect.SliceOf(requested)).Interface()
	fmt.Println(slice)
}

// output
// callback func(int) bool
// first parameter type int
// zero value: 0
// []