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implementation module backendsupport
import StdArray
from StdFunc import `bind`
from StdInt import +, ==
identity
:== \x -> x
// binding sugar
(==>) infix
(==>) f g
:== f `bind` g
// o` :== flip o
(o`) infixr
(o`) f g
:== \x -> g (f x)
(:-) infixl
(:-) a f
:== f a
foldState function list
:== foldState list
where
foldState []
= identity
foldState [hd:tl]
= function hd
o` foldState tl
foldStateA function array
:== foldStateA 0
where
arraySize
= size array
foldStateA index
| index == arraySize
= identity
// otherwise
= function array.[index]
o` foldStateA (index+1)
foldStateWithIndexA function array
:== foldStateWithIndexA 0
where
arraySize
= size array
foldStateWithIndexA index
| index == arraySize
= identity
// otherwise
= function index array.[index]
o` foldStateWithIndexA (index+1)
foldrA function result array
:== foldrA 0
where
arraySize
= size array
foldrA index
| index == arraySize
= result
// otherwise
= function array.[index] (foldrA (index+1))
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