String decodeQueryComponent(String encodedComponent, { Encoding encoding: UTF8 })

Decodes the percent-encoding in encodedComponent, converting pluses to spaces.

It will create a byte-list of the decoded characters, and then use encoding to decode the byte-list to a String. The default encoding is UTF-8.

Source

static String decodeQueryComponent(String encodedComponent,
    {Encoding encoding: UTF8}) {
  return _Uri._uriDecode(
      encodedComponent, 0, encodedComponent.length, encoding, true);
}