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iOS Development - Build a Simple iPhone App Quiz/Test Order Incorrect

The video "Getting to Know Arrays" doesn't explain how the method of finding the length of an array in Objective-C:

[arrayName count];

This is later explained in the beginning of the next video after the quiz.

3 Answers

Ben Jakuben
Ben Jakuben
Treehouse Teacher

That was by design, actually. :) Amit wanted to encourage students to figure out the correct method by using the documentation or playing around in Xcode. We get a fair amount of questions about this code challenge, though!

I was wondering if that was a possibility... how dubious. >:)

I actually went back a few minutes ago and entered this in:

NSArray *myArray = [[NSArray alloc] initWithObjects:
  @"Plums", nil];

  NSString *arrayAccessString = [myArray objectAtIndex:0];

  NSString *arrayLength = [myArray count];

...and it doesn't want to seem to work. I am at a loss with this test, because I'm getting a static error message reading "Bummer! No the method is not called 'length'..." which is assuming that the user is trying to do:

NSString *arrayLength = [myArray length];

After digging around in cumbersome documentation, I'm at a loss. Any pointers?

I got it:

NSLog (@"Number of elements in array = %f", [myArray count]);

I'm kinda in a epiphany caused personal crisis because of these format specifiers... I've been spoiled far too long with C++'s

cout << variable << endl;