Sign Up to our social questions and Answers Engine to ask questions, answer people’s questions, and connect with other people.
Login to our social questions & Answers Engine to ask questions answer people’s questions & connect with other people.
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Please briefly explain why you feel this question should be reported.
Please briefly explain why you feel this answer should be reported.
Please briefly explain why you feel this user should be reported.
I have a question regarding NSArray and NSMutableArray. I understand the difference between two primarily that NSArray is immutable and NSMutableArray is mutable. And as far as my research goes, there performance is kind of same too. There is one thing that I could not find a good answer for and that is if NSMutableArray uses more memory than NSArray and if NSMutableArray is somehow harsher on memory than NSArray.
I would really appreciate the suggestions and explanation.
Thanks
Vik
NSMutableArray uses slightly more memory for two (er, four, see comments) reasons:
1) Because it can change size, it can’t store the contents inside the object and must store a pointer to out of line storage as well as the extra malloc node for the storage
2) Because it would be very slow to resize one element at a time as things are added, it resizes in chunks, which may result in some unused space.