listLength : List a -> Int

amit-singhs / test-elm

This is a test elm repository.

test-elm-git-master.amit-singhs.vercel.app

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Open renovatorruler opened 3 years ago

renovatorruler commented 3 years ago

Create a function called listLength which will take a List a and return the number of elements in the list.

λ> listLength [123, 456, 789]
3
λ> listLength "Hello, world!"
13

amit-singhs commented 3 years ago

listLength : List a -> Int
listLength xs =
  case xs of
    [] -> 0
    head :: tail -> 1+listLength tail