How to check if an NSDictionary or NSMutableDictionary contains a key?

Question

I need to check if an dict has a key or not. How?

Answer 1

I'd suggest you store the result of the lookup in a temp variable, test if the temp variable is nil and then use it. That way you don't look the same object up twice:

id obj = [dict objectForKey:@"blah"];

if (obj) {
   // use obj
} else {
   // Do something else
}