Searching for a string within an array for an NSRange

Question

I am trying to search for a string within an array, but I only want to search the last five objects in the array for the string.

I have been fiddling with every parameter I can find on NSRange to no avail.

I would post some example code, but I can't even get out the line I need, whether its through introspection, enumeration, or just some NSRange call that I missed.

score 2 · Answer 1 · answered Dec 11 '12 at 09:51

2

If your array elements are strings that you searched for, you can directly check the array as follows:

if ([yourArray containsObject:yourString])
{
     int index = [yourArray indexOfObject:yourString];

     if (index>= yourArray.count-5)
     {
          // Your string matched
     }
}

answered Dec 11 '12 at 09:51

Anusha Kottiyal

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`+1` Nice solution. Duplicate objects might however cause trouble. – Anne Dec 11 '12 at 09:53

score 1 · Answer 2 · answered Dec 11 '12 at 09:56

I like indexesOfObjectsWithOptions:passingTest: for this. Example:

    NSArray *array = @[@24, @32, @126, @1, @98, @16, @67, @42, @44];
    // run test block on each element of the array, starting at the end of the array
    NSIndexSet *hits = [array indexesOfObjectsWithOptions:NSEnumerationReverse passingTest:^BOOL(id obj, NSUInteger idx, BOOL *stop) {
        // if we're past the elements we're interested in
        // we can set the `stop` pointer to YES to break out of
        // the enumeration
        if (idx < [array count] - 5) {
            *stop = YES;
            return NO;
        }
        // do our test -- if the element matches, return YES
        if (40 > [obj intValue]) {
            return YES;
        }
        return NO;
    }];
    // indexes of matching elements are in `hits`
    NSLog(@"%@", hits);

score 0 · Accepted Answer · answered Dec 11 '12 at 09:42

Try this :-

//Take only last 5 objects
NSRange range = NSMakeRange([mutableArray1 count] - 5, 5);
NSMutableArray *mutableArray2 = [NSMutableArray arrayWithArray:
                                  [mutableArray1 subarrayWithRange:range]];
//Now apply search logic on your mutableArray2
for (int i=0;i<[mutableArray2 count];i++)
    {
        if ([[mutableArray2 objectAtIndex:i] isEqualToString:matchString])
        {
            //String matched
        }
    }

Hope this helps you!

Searching for a string within an array for an NSRange

3 Answers3