title: Read-Only properties
body: <p>I need help with "read-only" in swift. I tried various ways, but simply couldn't figure out how to compile it without errors. Here's the question and what i thought of.</p>
  
  <p>Create a read-only computed property named isEquilateral that checks to see whether all three sides of a triangle are the same length and returns true if they are and false if they are not.</p>
  
  <pre><code>var isEquilateral: Int {
  
  }
  </code></pre>