Not always faster
A few weeks ago, I was asked how to sort an array, and I was prompt to answer “using GCD”. Bilal LoLo (@anabillo) ask again “why not NSSortDescriptor”, and I was “because GCD is faster”. Is it? Well, there is an obvious way to know. Truth be told, I was using sort descriptors before GCD was introduced to the phone. And when it was introduced, I automatically assumed that because GCD is terrible fast, then anything is faster in GCD. Well, it turns out that the old fashion and well known sort descriptor beats GCD here. And not by a marging, but by an order of magnitude. Moral of a fable? It worth checking asumptions with real code.
And talking about code, here’s the meat.
