title: Can I combine a list of similar dataframes into a single dataframe?
body: <p>I have a dataframe:</p>
  
  <pre><code>foo &lt;- list(df1 = data.frame(x=c('a', 'b', 'c'),y = c(1,2,3)), 
              df2 = data.frame(x=c('d', 'e', 'f'),y = c(4,5,6)))
  </code></pre>
  
  <p>Can I convert it to a single dataframe of the form:</p>
  
  <pre><code>data.frame(x = c('a', 'b', 'c', 'd', 'e', 'f'), y= c(1,2,3,4,5,6))
  </code></pre>
  
  <p>?</p>