how to check if array is null or empty in ios sdk?

Question

I want to check if my Bond is empty or null and NULL value.

{
Bonds =(
      {
        DOB = "12/09/1988";
        about = "";
      }
      );
User =     {
    city = CA;
    email = "[email protected]";
};
success = True;
}

Second time this type get data how to check Bond key

{
Bonds = Null;
User =     {
    city = CA;
    email = "[email protected]";
};
success = True;
}

possible duplicate of What is the right way to check for a null string in Objective-C? — mbogh
– mbogh, Commented Dec 12, 2014 at 9:21
Apparently nil and NULL are two different kind of beasts... — user623396
– user623396, Commented Dec 12, 2014 at 9:22

meda · Accepted Answer · 2014-12-12 09:18:27Z

7

You just check for nil

if(data[@"Bonds"]==nil){
  NSLog(@"it is nil");
}

or

if ([data[@"Bonds"] isKindOfClass:[NSNull class]]) {
    NSLog(@"it is null");
}

answered Dec 12, 2014 at 9:18

meda

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Comments

sanjeet · Accepted Answer · 2014-12-12 09:30:49Z

5

if ([data[@"Bonds"] isKindOfClass:[NSNull class]] || data[@"Bonds"] == nil || [data[@"Bonds"] isEqualToString:@""]) {

}

answered Dec 12, 2014 at 9:30

sanjeet

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Comments

Vinay Chavan · Accepted Answer · 2014-12-12 09:24:42Z

2

[NSNull null] always returns a same object so this should work fine.

if (dictionary[@"Bonds"] != [NSNull null]) {
    // requried data is present, now check if it is nil or empty.
}

answered Dec 12, 2014 at 9:24

Vinay Chavan

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4 Comments

Johan Karlsson Over a year ago

I think the solution is provided in the wrong implementation language. Null is not the same as NSNUll.

gnasher729 Over a year ago

Perfect answer and the recommended way to check for NSNull objects.

gnasher729 Over a year ago

@JohanKarlsson: It should be obvious that the output that you saw comes from an NSLog statement, and that's how NSLog logs NSNull objects. Your comment is totally wrong.

Johan Karlsson Over a year ago

Hmmm... looking at the question there is nothing that indicates that this is an output from NSLog. It is clearly JSON output. However looking at the tags I would have noticed that this is Objective-C. So my bad.

cyberlobe · Accepted Answer · 2014-12-12 09:41:55Z

2

check: if (![dataArray isKindOfClass:[NSNull class]]) &&

check if it having elements [dataArray firstObject] - to check array having one or more elements.

edited Dec 12, 2014 at 9:41

cyberlobe

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answered Dec 12, 2014 at 9:35

Sam

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Comments

cyberlobe · Accepted Answer · 2014-12-12 09:38:00Z

1

The best possible way should be:

if (!data[@"Bonds"] || ![data[@"Bonds"] count]){
    NSLog(@"Data Found");
}else{
    NSLog(@"Data Not Found");
}

answered Dec 12, 2014 at 9:38

cyberlobe

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