Speaking of concurrent programming and parallelism. If you're not into functional programming, check out Apple's Grand Central Dispatch[1] and Objective-C Block

Speaking of concurrent programming and parallelism. If you're not into functional programming, check out Apple's Grand Central Dispatch[1] and Objective-C Blocks[2]. Unless you write your own Objective-C http server and run it on Mac OS X Server (it's not that hard, I've done it), this isn't very useful for Web programming. However, if you're comparing the languages / frameworks themselves (you can use all three to code command line tools, for example), GCD becomes a very seductive option. GCD works by throwing code blocks (obj-c closures) into queues, and letting the runtime do its magic. You can have it execute code synchronously, asynchronously, or in parallel. GCD will optimize and distribute your blocks the the available CPU cores. You can even enumerate using blocks, and instead of doing loop iterations one by one, it'll distribute them to the cores in parallel. [1]: http://en.wikipedia.org/wiki/Grand_Central_Dispatch http://en.wikipedia.org/wiki/Grand_Central_Dispatch [2]: http://developer.apple.com/library/ios/#documentation/cocoa/Conceptual/Blocks/Articles/bxGettingStarted.html#//apple_ref/doc/uid/TP40007502-CH7-SW1 http://developer.apple.com/library/ios/#documentation/cocoa/...