title: Swift convert Currency string to double
body: <p>I have a string, <code>"$4,102.33"</code> that needs to be converted to double. This will always be US. My only way is a hack to strip out the <code>$</code> and <code>,</code> and then convert to double. Seems like <code>NSFormatter</code> only lets me convert TO a currency and not from it. Is there a built-in function or better way than just removing the <code>$</code> and <code>,</code>? prior to converting it to double?</p>