Unable to check constant value is null or not

Question

i have constant for language.At first time when constant value null i want to set a specific value on this constant i write the given below code but its not working correct :

  NSLog(@"Constant value:%@",[Constant getLangCode]);// this print null
  if([[Constant getLangCode] isEqualToString:null])  //this if is not working always goes else 
   {
    NSLog(@"null");
    [Constant updateLangCode:@"en"];
   }
 else
   {
   NSLog(@"null else");
    [Constant updateLangCode:@"en"];
   }

this gives following output:

       constant value:(null)
        null else

check this http://stackoverflow.com/questions/5684157/how-to-detect-if-nsstring-is-null/5684166#5684166 — dopcn, Sep 14 '14 at 06:29

score 1 · Accepted Answer · answered Sep 14 '14 at 06:20

This can't work. Check whether the value is nil like this

  if([Constant getLangCode] == nil)

or in short

  if(![Constant getLangCode])

But even then your code doesn't make any sense because in both cases you call the same method with the same parameter. Why do you need the if statement?

Unable to check constant value is null or not

1 Answers1