NSPredicate to filter data in iPhone

Hi,
Please check the below lines for filtering a content of an array using "NSPredicate".

Example:

//For Boolean value checking in Array containing dictionaries.
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"(isCheck == %@)",@"true"];
NSArray *filterArr = [tmpArray filteredArrayUsingPredicate:predicate];

NSPredicate *filter = [NSPredicate predicateWithFormat:[NSString stringWithFormat:@"ServiceLevel = '0'"]];        
NSArray *filteredArray = [[tmpArray filteredArrayUsingPredicate:filter]copy];











Thanks