 <p>The method you want is <code>toInt()</code> -- you have to be a little careful, since the <code>toInt()</code> returns an optional Int.</p> <pre><code>let stringNumber = "1234" let numberFromString = stringNumber.toInt() // numberFromString is of type Int? with value 1234 let notANumber = "Uh oh" let wontBeANumber = notANumber.toInt() // wontBeANumber is of type Int? with value nil </code></pre>