How to put code with if in a separate method? - flutter

Question

I'm using app navigation but I'm facing a problem that I can't put the if (initialLink != null)... code in a separate method so that I can then duplicate this method in different parts of the code, can you tell me how can I put this code in a separate method?
class AppRouter {
final BuildContext context;
AppRouter(this.context);
RouteMap buildRouteMap(PendingDynamicLinkData? initialLink) {
return RouteMap(
onUnknownRoute: (route) => const Redirect('/'),
routes: {
'/': (route) {
bool loggedIn =
Provider.of<AppState>(context, listen: false).isLoggedIn;
if (initialLink != null) {
String code;
final Uri deepLink = initialLink.link;
final String deeplinkString = deepLink.toString();
code = deepLink.queryParameters['code'] ?? 'No code';
var start = deeplinkString.lastIndexOf('/') + 1;
var end = deeplinkString.indexOf('?');
var extract = deeplinkString.substring(start, end);
if (extract == 'password-reset') {
return Redirect(
'/login/forgot-password',
queryParameters: {
'isSendEmail': 'true',
'code': code,
},
);
}
}
return const MaterialPage(
child: PhoneNumberPage(),
);
},
'/map': (route) {
bool loggedIn =
Provider.of<AppState>(context, listen: false).isLoggedIn;
if (loggedIn) {
return const Redirect('/home');
}
return const MaterialPage(
child: MapPage(
isUserAuth: false,
),
);
},
code to be placed in a separate function
if (initialLink != null) {
String code;
final Uri deepLink = initialLink.link;
final String deeplinkString = deepLink.toString();
code = deepLink.queryParameters['code'] ?? 'No code';
var start = deeplinkString.lastIndexOf('/') + 1;
var end = deeplinkString.indexOf('?');
var extract = deeplinkString.substring(start, end);
if (extract == 'password-reset') {
return Redirect(
'/login/forgot-password',
queryParameters: {
'isSendEmail': 'true',
'code': code,
},
);
}
}

Answer 1

try this.
void commonFunction(){
if (initialLink != null) {
String code;
final Uri deepLink = initialLink.link;
final String deeplinkString = deepLink.toString();
code = deepLink.queryParameters['code'] ?? 'No code';
var start = deeplinkString.lastIndexOf('/') + 1;
var end = deeplinkString.indexOf('?');
var extract = deeplinkString.substring(start, end);
if (extract == 'password-reset') {
return Redirect(
'/login/forgot-password',
queryParameters: {
'isSendEmail': 'true',
'code': code,
},
);
}
}
}
then call commonFunction() every where you need.

Answer 2

You use initialLink as the judgement of if..else condition. When you extract them you need to provide that parameter. Otherwise the code cannot find initialLink.
void commonFunction(PendingDynamicLinkData? initialLink){
if (initialLink != null) {
String code;
final Uri deepLink = initialLink.link;
final String deeplinkString = deepLink.toString();
code = deepLink.queryParameters['code'] ?? 'No code';
var start = deeplinkString.lastIndexOf('/') + 1;
var end = deeplinkString.indexOf('?');
var extract = deeplinkString.substring(start, end);
if (extract == 'password-reset') {
return Redirect(
'/login/forgot-password',
queryParameters: {
'isSendEmail': 'true',
'code': code,
},
);
}
}
}