title: How to concatenate a string in a do block?
body: <p>I'm trying to go though a array and add characters from that array to another object. The problem is I keep getting a error "Instances of character are not indexable".  However when I run  tag := tag,char outside of the do block then it works.</p>
  
  <pre><code>|data startTag tag|.
  data := '123456778'
  startTag := false.
  tag := ''.
  data asArray do: [:char |
       tag := tag,char] 
  </code></pre>