title: How to delete a word in Vim
body: <p>I'm a vim user and I want to delete a keyword. I always use "dw" to delete specific keyword, but it sometimes doesn't work well. For example, I want to delete "valule123" in sample program.</p>
  
  <pre><code>ex) public void function(int valule123)
  </code></pre>
  
  <p>When I put my cursor is on "2", and then I input "dw", only part of keyword is deleted and the result is "val1". Why?</p>
  
  <p>I tried another command, "daw". In this case, the result is just as expected! But what does "a" mean? I think "a" means "add".</p>