toString method
A string representation of this object.
Some classes have a default textual representation,
often paired with a static parse function (like int.parse).
These classes will provide the textual representation as
their string representation.
Other classes have no meaningful textual representation
that a program will care about.
Such classes will typically override toString to provide
useful information when inspecting the object,
mainly for debugging or logging.
Implementation
@override
String toString() => '?origin=${_convertLocation(origin)}&'
'destination=${_convertLocation(destination)}'
'${_addIfNotNull('mode', travelMode?.toString().toLowerCase())}'
'${_addIfNotNull('waypoints', _convertWaypoints())}'
'${_addIfNotNull('alternatives', alternatives)}'
'${_addIfNotNull('avoid', _convertAvoids())}'
'${_addIfNotNull('units', unitSystem)}'
'${_addIfNotNull('region', region)}'
'${_addIfNotNull('language', language)}'
'${drivingOptions == null ? '' : drivingOptions.toString()}'
'${transitOptions == null ? '' : transitOptions.toString()}';