what is difference between alloc and allocWithZone:?

Question

From forum discussion , seem like that the big difference is performance factor, allocWithZone: will alloc memory from particular memory area, which reduce cost of swapping.

Answer 1

I use allocWithZone in singleton. As Forrest mentioned, the variables created allocated from the same region of memory. Thus other classes can use or access them from the same zone of memory. Save memory space when you run your app.