def map = self : Array,index : Int,mapper(t) -> t do
	i = index

	while i < self.len() do
		self(i) = mapper(self(i))
		i++..
def mapIndex = self : Array,index : Int,mapper(i, t) -> t do
	i = index

	while i < self.len() do
		self(i) = mapper(i, self(i))
		i++..