Difference between revisions of "ifp"

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m (Yaxu moved page Ifp to ifp)
 
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{{DISPLAYTITLE:ifp}}  
 
{{DISPLAYTITLE:ifp}}  
[[Type signature|Type]]: <source inline></source>
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[[Type signature|Type]]: <source inline>ifp :: (Int -> Bool) -> (Pattern a -> Pattern a) -> (Pattern a -> Pattern a) -> Pattern a -> Pattern a</source>
  
 
'''ifp''' decides whether to apply one or another function depending on the result of a test function, which is passed the current cycle as a number. For example:
 
'''ifp''' decides whether to apply one or another function depending on the result of a test function, which is passed the current cycle as a number. For example:

Latest revision as of 18:47, 28 April 2019

Type: ifp :: (Int -> Bool) -> (Pattern a -> Pattern a) -> (Pattern a -> Pattern a) -> Pattern a -> Pattern a

ifp decides whether to apply one or another function depending on the result of a test function, which is passed the current cycle as a number. For example:

d1 $ ifp ((== 0).(flip mod 2))
  (striate 4)
  (# coarse "24 48") $
  sound "hh hc"

This will apply striate 4 for every even cycle, and # coarse "24 48" for every odd one.

Detail: The test function does not rely on anything tidal-specific, it uses plain Haskell functionality for operating on numbers. That is, it calculates the modulo of 2 of the current cycle which is either 0 (for even cycles) or 1. It then compares this value against 0 and returns the result, which is either True or False. This is what the first part of ifp's type signature signifies (Int -> Bool), a function that takes a whole number and returns either True or False.