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Fix various "it's" -> "its" for Haskell doc
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@ -5,7 +5,7 @@ author_url: http://adit.io
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---
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Haskell was designed as a practical, purely functional programming language. It's famous for
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it's monads and it's type system, but I keep coming back to it because of it's elegance. Haskell
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its monads and its type system, but I keep coming back to it because of its elegance. Haskell
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makes coding a real joy for me.
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```haskell
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@ -222,7 +222,7 @@ True :: Bool
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-- Here's a function that takes two arguments:
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-- add :: Integer -> Integer -> Integer
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-- When you define a value, it's good practice to write it's type above it:
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-- When you define a value, it's good practice to write its type above it:
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double :: Integer -> Integer
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double x = x * 2
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@ -309,7 +309,7 @@ main = do
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-- Haskell does IO through a monad because this allows it to be a purely
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-- functional language. Our `action` function had a type signature of `IO String`.
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-- In general any function that interacts with the outside world (i.e. does IO)
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-- gets marked as `IO` in it's type signature. This lets us reason about what
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-- gets marked as `IO` in its type signature. This lets us reason about what
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-- functions are "pure" (don't interact with the outside world or modify state)
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-- and what functions aren't.
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