List comprehensions: Difference between revisions
→{{header|AppleScript}}: Updated primitives
m (→{{header|Haskell}}: (Added a type signature)) |
(→{{header|AppleScript}}: Updated primitives) |
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{{trans|JavaScript}}
<lang AppleScript>-- List comprehension by direct and unsugared use of list monad
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on pythagoreanTriples(maxInteger)
script X
on
script Y
on
script Z
on
if X * X + Y * Y = Z * Z then
unit([X, Y, Z])
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[]
end if
end
end script
bind(Z,
end
end script
bind(Y,
end
end script
bind(X,
end pythagoreanTriples
-- TEST -----------------------------------------------------------------------
on run
-- Pythagorean triples drawn from integers in the range [1..n]
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pythagoreanTriples(25)
--> {{3, 4, 5}, {5, 12, 13}, {6, 8, 10}, {7, 24, 25}, {8, 15, 17},
-- {9, 12, 15}, {12, 16, 20}, {15, 20, 25}}
end run
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-- concat :: a -> a -> [a]
script concat
on
a & b
end
end script
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--
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
-- foldl :: (a -> b -> a) -> a -> [b] -> a
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set lng to length of xs
repeat with i from 1 to lng
set v to
end repeat
return v
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set lst to {}
repeat with i from 1 to lng
set end of lst to
end repeat
return lst
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else
script
property
end script
end if
end mReturn</lang>
▲-- range :: Int -> Int -> [Int]
▲on range(m, n)
▲ if n < m then
▲ set d to -1
▲ 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
{{Out}}
<lang AppleScript>{{3, 4, 5}, {5, 12, 13}, {6, 8, 10}, {7, 24, 25}, {8, 15, 17}, {9, 12, 15}, {12, 16, 20}, {15, 20, 25}}</lang>
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