title: Is there any way to comment out line(s) of code in function in Elixir
body: <p>Is there any ways to comment out a line or lines of code in a function?</p>
  
  <p>something like the following</p>
  
  <pre><code>defmodule MyModule
    def foo do
      //a = "old code"
      a = "new code"
    end
  end
  </code></pre>
  
  <p>or</p>
  
  <pre><code>defmodule MyModule
    def foo do
      /*a = "old code"
      b = 1234 */
      a = "new code"
    end
  end
  </code></pre>