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iOS Object-Oriented Objective-C Memory, Arrays and Loops, Oh My! Introduction to NSArray and NSMutableArray

ARMANDO RODRIGUEZ
ARMANDO RODRIGUEZ
4,216 Points
Posted by ARMANDO RODRIGUEZ
ARMANDO RODRIGUEZ
4,216 Points

On the quiz, you must be checking code wrong. I wrote my alloc init one line, three different ways, all failed...

[[NSMutableDictionary alloc] initWithObjectsAndKeys:@"Make",@"Honda",@"Model",@"Accord",nil];

This failed.

[NSMutableDictionary dictionaryWithObjectsAndKeys:@"Make",@"Honda",@"Model",@"Accord",nil];

This also failed.

Please fix your code check.

3 Answers

jcorum
jcorum
71,830 Points
jcorum
jcorum
71,830 Points

Here you go:

NSDictionary *carDict = [[NSDictionary alloc] initWithObjectsAndKeys:@"Honda",@"Make",@"Accord",@"Model", nil];
NSString *myRide = [[NSString alloc] init];
myRide = [carDict valueForKey: @"Make"];
Kris Rajendren
Kris Rajendren
12,822 Points

In step three even with the right code the simulator says Step 2 did not Pass and asks us to go to Step 2 again in a loop.

Mark Reid
Mark Reid
1,948 Points
Mark Reid
Mark Reid
1,948 Points

The problem with this code in this question is that the objects and keys are reversed.

They should be @"Honda",@"Make",@"Accord",@"Model". You have them as @"Make",@"Honda",@"Model",@"Accord".

Subtle difference but that's why the code check is failing.

jcorum
jcorum
71,830 Points
jcorum
jcorum
71,830 Points

Kris, I just tried it again (https://teamtreehouse.com/library/objectoriented-objectivec/memory-arrays-and-loops-oh-my/alloc-and-init-2), because sometimes the challenges get changed, but it still worked fine, for all 3 tasks. So I'm not sure what you meant by not passing Step 2.

Kris Rajendren
Kris Rajendren
12,822 Points

Thank you. It worked. I was extracting the @"Model" key by mistake instead of @"Make". It was such a simple error that it never even occurred to me to check for it.