title: Haskell: Check if Int is in a list of Int's
body: <p>I am new to Haskell, sorry if this is a basic question.</p>
  
  <p>I currently have a list of Int's and I am trying to create a function that takes a variable x and returns a boolean depending whether the variable exists in the list.</p>
  
  <p>I have had a search and found Data.List find function but this dosent seem to return a boolean.</p>
  
  <p>I am using GHCi.</p>
  
  <p>Thanks,</p>