Number 5

Please watch the tutorial movie [when the number 5 is related to the Hat] my opinion it's sound a mistake or I didn't understand it correctly the calculation.

when you call random(10), it returns a random number from 0 -9. (the hat is filled with numbers from 0 - 9) so in the video, the function is called and it returns 5. (we drew a 5 from the hat). the number 5 is used to index the array of predictions.

Okay but when I say objectAtIndex:5 what number from the scope than need to be choose? as I understand from your words the "system" choose Random number from 0-9?

objectAtIndex 5 would choose the object at index 5 in the array. this is what happens in the code:

//choose a random number from 0 to the length of the array. this is like drawing from the hat filled with numbered balls
int random = arc4random_uniform(self.predictions.count);

//set the text of the label using the random number as the index of the array. so if the random number was 5, it would choose the 6th item in the array. 
self.predictionLabel.text = [self.predictions objectAtIndex:random]

Thanks for your help! I'll do trial and error to the subject

Thanks!) Sincerely, Golan