title: If statement help on when to use commas and spaces
body: <p>Basically I've built up a string and I need to put an if statement on when to use a comma and a space. So basically I need it be after the first element and not on the last element. </p>
  
  <p>This is what my current code is: </p>
  
  <p>And the output it returns is</p>
  
  <p>"thing1thing2thing3"</p>
  
  <p>I want to make the output to be</p>
  
  <p>"thing1, thing2, thing3"</p>
  
  <p>And I need an if statement as part of the requirements on when to place the commas and spaces. </p>
  
  <p>Thanks in advance. </p>