dust/std/list_functions.ds

find = |items <list> function <fn>| <any> {
	for i in items {
		if (function i) {
			return i
		}
	}
}

map = |items <list> function <fn>| <list> {
	new_list = []
	
	for i in items {
		new_list += (function i)
	}

	new_list
}

foobar <int> = [0 1 2]
	-> (map |i <int>| <int> { i - 1 })
	-> (find |i <int>| <bool> { i == -1 })

foobar