Production Haskell by Matt Parsons

Author:Matt Parsons [Matt Parsons]
Language: eng
Format: epub
Publisher: leanpub.com
Published: 2020-10-07T00:00:00+00:00

Looking much nicer. Working with the list constructor functions is annoying though. A common pattern is to have a single listing: NEL.replicate 5 (155 x 5) is okay, but it’d be nicer to write that as 155 x 5 x 5. So let’s write an instance of Num for our NonEmpty Set.

1 instance 2 (a ~ Int, b ~ Int) 3 => 4 Num (X -> a -> X -> b -> NonEmpty Set) 5 where 6 fromInteger i = \X r X s -> fromInteger i x r *: s 7 8 (*:) :: Set -> Int -> NonEmpty Set 9 (*:) w i = w :| replicate (i-1) w 10 11 firstSession = 12 2019 05 07 #: 13 [ "bench press" %: 14 155 x 5 x 5 15 , "deadlift" %: 16 [ 225 x 5 17 , 275 x 3 18 ] 19 <> 315 x 1 x 3 20 ]

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