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Define meta and replace. #972

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Define meta and replace. #972

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Commits on Nov 27, 2022

  1. Define meta and replace. 

      +meta :: forall a b.
  +        Pattern (Pattern a -> Pattern b) -> Pattern a -> Pattern b

  +replace :: forall a b. Ord a =>
  +           [(a,b)] -> Pattern a -> Pattern b

Here's a minimal example using both.

  This plays the pattern "ho*8"
  at normal speed for the first half,
  and at double speed for the second half.

  let slang = [ (0, id)
               , (1, fast 2) ]
     in p 1 $ meta (replace slang "0 1") "ho*8"
    @JeffreyBenjaminBrown
    JeffreyBenjaminBrown committed Nov 27, 2022
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