title: What's the point of 'const' in the Haskell Prelude?
body: <p>Looking through the Haskell Prelude, I <a href="http://hackage.haskell.org/package/base-4.9.0.0/docs/src/GHC.Base.html#const" rel="noreferrer">see a function</a> <code>const</code>:</p>
  
  <pre><code>const x _ = x
  </code></pre>
  
  <p>I can't seem to find anything relevant regarding this function.</p>
  
  <p>What's the point? Can anyone give an example of where this function might be used?</p>