title: What does the triple less-than sign (`<<<`) do in PureScript?
body: <p>I've seen this code in <a href="https://github.com/bodil/purescript-is-magic/blob/master/src/Main.purs#L111" rel="noreferrer">a PureScript program</a>, what does <code>&lt;&lt;&lt;</code> do?</p>
  
  <pre><code>pinkieLogic :: (Tuple Boolean GameObject) -&gt; GameObject -&gt; GameObject
  pinkieLogic (Tuple jumpPressed hater) p =
    hated hater p
    (solidGround
     &lt;&lt;&lt; gravity
     &lt;&lt;&lt; velocity
     &lt;&lt;&lt; jump jumpPressed
     &lt;&lt;&lt; clearSound)
  </code></pre>