generic

type ConcreteMap map[interface{}]interface{}

type Iterator func(key, val interface{})

type Map interface {
	IsEmpty() bool
	Count() int
	Keys() []interface{}
	Has(key interface{}) bool
	Except(keys []interface{}) Map
	IsNil(key interface{}) bool
	NotNil(key interface{}) bool
	Get(key interface{}) interface{}
	Set(key interface{}, value interface{})
	Delete(key interface{})
	String() string
}

type Reducer func(key, val interface{}, reducedVal Map) Map