RosettaCodeData/Task/Currying/AppleScript/currying.applescript

99 lines
1.8 KiB
AppleScript

-- curry :: (Script|Handler) -> Script
on curry(f)
script
on |λ|(a)
script
on |λ|(b)
|λ|(a, b) of mReturn(f)
end |λ|
end script
end |λ|
end script
end curry
-- TESTS ----------------------------------------------------------------------
-- add :: Num -> Num -> Num
on add(a, b)
a + b
end add
-- product :: Num -> Num -> Num
on product(a, b)
a * b
end product
-- Test 1.
curry(add)
--> «script»
-- Test 2.
curry(add)'s |λ|(2)
--> «script»
-- Test 3.
curry(add)'s |λ|(2)'s |λ|(3)
--> 5
-- Test 4.
map(curry(product)'s |λ|(7), enumFromTo(1, 10))
--> {7, 14, 21, 28, 35, 42, 49, 56, 63, 70}
-- Combined:
{curry(add), ¬
curry(add)'s |λ|(2), ¬
curry(add)'s |λ|(2)'s |λ|(3), ¬
map(curry(product)'s |λ|(7), enumFromTo(1, 10))}
--> {«script», «script», 5, {7, 14, 21, 28, 35, 42, 49, 56, 63, 70}}
-- GENERIC FUNCTIONS ----------------------------------------------------------
-- enumFromTo :: Int -> Int -> [Int]
on enumFromTo(m, n)
if n < m then
set d to -1
else
set d to 1
end if
set lst to {}
repeat with i from m to n by d
set end of lst to i
end repeat
return lst
end enumFromTo
-- map :: (a -> b) -> [a] -> [b]
on map(f, xs)
tell mReturn(f)
set lng to length of xs
set lst to {}
repeat with i from 1 to lng
set end of lst to |λ|(item i of xs, i, xs)
end repeat
return lst
end tell
end map
-- Lift 2nd class handler function into 1st class script wrapper
-- mReturn :: Handler -> Script
on mReturn(f)
if class of f is script then
f
else
script
property |λ| : f
end script
end if
end mReturn