Apply a callback to an array: Difference between revisions
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For a more general implementation of '''map(list, function)''' |
For a more general implementation of '''map(list, function)''', '''reduce(list, function, startValue)''', and '''filter(list, predicate)''', we could write: |
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<lang applescript>-- [a] -> (a -> b) -> [b] |
<lang applescript>-- [a] -> (a -> b) -> [b] |
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end repeat |
end repeat |
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end reduce |
end reduce |
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-- [a] -> (a -> Bool) -> [a] |
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on filter(xs, f) |
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set mf to mReturn(f) |
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set lst to {} |
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set lng to length of xs |
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repeat with i from 1 to lng |
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set v to item i of xs |
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if mf's call(v, i, xs) then |
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set end of lst to v |
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end if |
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end repeat |
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return lst |
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end filter |
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-- An ordinary AppleScript handler function |
-- An ordinary AppleScript handler function |
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a + b |
a + b |
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end sum |
end sum |
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on isEven(n) |
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n mod 2 = 0 |
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end isEven |
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set |
set xs to {1, 2, 3, 4, 5, 6, 7, 8, 9, 10} |
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{map( |
{map(xs, square), reduce(xs, sum, 0), filter(xs, isEven)}</lang> |
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{{Out}} |
{{Out}} |
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<pre>{{1, 4, 9, 16, 25, 36, 49, 64, 81, 100}, 55}</pre> |
<pre>{{1, 4, 9, 16, 25, 36, 49, 64, 81, 100}, 55, {2, 4, 6, 8, 10}}</pre> |
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=={{header|AutoHotkey}}== |
=={{header|AutoHotkey}}== |
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