<p>
The built-in functions <code>len</code> and <code>cap</code> take arguments
of various types and return a result of type <code>int</code>.
The implementation guarantees that the result always fits into an <code>int</code>.
</p>

<pre class="grammar">
Call      Argument type    Result

len(s)    string type      string length in bytes
          [n]T, *[n]T      array length (== n)

Alice.

  `Why, there they are!' said the King triumphantly, pointing to
the tarts on the table.  `Nothing can be clearer than THAT.
Then again--"BEFORE SHE HAD THIS FIT--"  you never had fits, my
dear, I think?' he said to the Queen.

  `Never!' said the Queen furiously, throwing an inkstand at the
Lizard as she spoke.  (The unfortunate little Bill had left off