title: How to initialize a Scala immutable hashmap with values?
body: <p>What's the syntax to set immutable hashmap contents on initialization?</p>
  
  <p>For example, if I was willing to hardcode an array, I'd write:</p>
  
  <blockquote>
    <p>val a = Array (0, 1, 2, 3)</p>
  </blockquote>
  
  <p>What's the analogue for immutable hashmaps (say I want it to contain 0->1 and 2->3 pairs) (in Scala 2.8)?</p>