CODEWITHSUNDEEP
objective-cnsarray
Alex Stelea
Alex Stelea

Reputation: 1219

checking if an array doesn't contain a certain object

is there a class available to check if an array doesn't contain an object? I want to do something like

if [(myarray doesntContain @"object")]

is this possible

Upvotes: 34

Views: 53034

Answers (3)

Alex Gray
Alex Gray

Reputation: 16473

I wrote an NSArray category to achieve these negated checks via instance methods, as you had originally requested.. The first is for an array-type set group of objects, the latter for a singular check. These return YES in the case that the array instance DOES NOT contain the passed object or objects. Why? Exclamation marks confuse me.

NSArray+Additions.h

-(BOOL)doesNotContainObjects:(id<NSFastEnumeration>)enumerable;

-(BOOL)doesNotContainObject:(id)object;

NSArray+Additions.m

-(BOOL)doesNotContainObjects:(id<NSFastEnumeration>)enumerable {
   for (id x in enumerable) {
     if ([self containsObject:x]) return NO; // exists, abort!
   }
   return YES;   // it ain't in there, return TRUE;
}
- (BOOL)doesNotContainObject:(id)object {
  if ([self containsObject:object]) return NO; return YES;
}

Upvotes: 1

Georg Fritzsche
Georg Fritzsche

Reputation: 99122

For NSArray use -containsObject::

if (![myarray containsObject:someObject]) {
    // ...
}

Upvotes: 104

Rob
Rob

Reputation: 45799

If you're dealing with an NSArray, your first port of call should probably be the Apple documentation for NSArray, and probably the method containsObject, there's an example in this question.

Upvotes: 0

Related Questions