61 lines
1.7 KiB
Text
61 lines
1.7 KiB
Text
{-|
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Concatenate a `NonEmpty` list of `NonEmpty` lists into a single `NonEmpty`
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list
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-}
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let NonEmpty =
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missing
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sha256:e2e247455a858317e470e0e4affca8ac07f9f130570ece9cb7ac1f4ea3deb87f
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? ./Type.dhall
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let NonEmpty/toList =
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missing
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sha256:0977fe14b77232a4451dcf409c43df4589c4b3cdde7b613aab8df183be1b53f5
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? ./toList.dhall
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let List/concatMap =
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missing
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sha256:3b2167061d11fda1e4f6de0522cbe83e0d5ac4ef5ddf6bb0b2064470c5d3fb64
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? ../List/concatMap.dhall
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let concat
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: ∀(a : Type) → NonEmpty (NonEmpty a) → NonEmpty a
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= λ(a : Type) →
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λ(xss : NonEmpty (NonEmpty a)) →
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{ head = xss.head.head
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, tail =
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xss.head.tail
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# List/concatMap (NonEmpty a) a (NonEmpty/toList a) xss.tail
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}
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let example0 =
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assert
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: concat
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Natural
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{ head = { head = 0, tail = [ 1, 2 ] }
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, tail =
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[ { head = 3, tail = [ 4 ] }, { head = 5, tail = [ 6, 7, 8 ] } ]
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}
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≡ { head = 0, tail = [ 1, 2, 3, 4, 5, 6, 7, 8 ] }
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let example1 =
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assert
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: concat
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Natural
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{ head = { head = 0, tail = [] : List Natural }
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, tail =
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[ { head = 1, tail = [] : List Natural }
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, { head = 2, tail = [] : List Natural }
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]
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}
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≡ { head = 0, tail = [ 1, 2 ] : List Natural }
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let example2 =
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assert
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: concat
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Natural
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{ head = { head = 0, tail = [] : List Natural }
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, tail = [] : List (NonEmpty Natural)
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}
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≡ { head = 0, tail = [] : List Natural }
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in concat
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