objective c - How can you shorten repetitive if/else statements? -

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how can simplify code? gets lengthy , extremely repetitive, many null checks. 

    id data;      data = [dictionary objectforkey:@"firstname"];     if ([data isequal:[nsnull null]]) {         self.firstname = @"";     }     else{         self.firstname = (nsstring *)data;     }      data = [dictionary objectforkey:@"middlename"];     if ([data isequal:[nsnull null]]) {         self.middlename = @"";     }     else{         self.middlename = (nsstring *)data;     }      data = [dictionary objectforkey:@"lastname"];     if ([data isequal:[nsnull null]]) {         self.lastname = @"";     }     else{         self.lastname = (nsstring *)data;     }      ...

ideally want put variables in array of sorts, , loop through , apply null check , assignment of them. can't store variables in array. best way shorten code?

you wrap each of calls 1 method.

- (nsstring *)stringfromdictionary:(nsdictionary *) forkey:(nsstring *)key  {     id data = [dictionary objectforkey:key];     if ([data iskindofclass:[nsstring class]]) {         return = (nsstring *)data;     } else {         return @"";     } }

then call method 3 times.

self.firstname = [self stringfromdictionary:dictionary forkey:@"firstname"]; self.middlename = [self stringfromdictionary:dictionary forkey:@"middlename"]; self.lastname = [self stringfromdictionary:dictionary forkey:@"lastname"];

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