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1. Understanding fs2 `Pull` Understanding fs2 `Pull`

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   # Undertsanding the `Pull` type from fs2

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   ## From the scaladocs

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   ```scala

2. Example of Contravariant Predicate Example of Contravariant Predicate

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    import $ivy.`org.typelevel::cats-core:1.5.0`

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    import cats.Contravariant

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    import cats.implicits._

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   {

3. A Streaming library with a superpow... A Streaming library with a superpower: Functional Programming

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   # A Streaming library with a superpower: Functional Programming

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   Scala has a very unique streaming library called FS2 (Functional Streams for Scala). 

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   This library embodies all the advantages of functional programming(FP).

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   By understanding its design goals you will get exposure to the core ideas that makes FP so appealing. 

4. Lift a non safe function to a safe one Lift a non safe function to a safe one

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   def notSafeFunc: String  => Int = _.toInt

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   notSafeFunc("1") // 1

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   notSafeFunc("a") // java.lang.NumberFormatException: For input string: "a"

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   import $ivy.`org.typelevel::cats-core:1.5.0`

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   import cats.implicits._

5. haskell flip in Scala haskell flip in Scala

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   def flip[A,B,C]: (A => B => C) => (B => A => C) = f => x => y => f(y)(x)

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   def f: Int => String => Int=  a => b => a + b.toInt

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   flip(f)("1")(2)

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   def ++ : String => String => String = a => b => a + b

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   flip(++)("Hello")("World")