enumFromString method
This converts a String value v
to enum
value,
returns null
when no enum value matches the string
Implementation
T? enumFromString(String? v){
T? _enumItem;
for(var i=0; i<enumValues.length; i++){
final item = enumValues[i];
if(value(item) == v){
_enumItem = item;
break;
}
}
return _enumItem;
}