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Ok, pardon my ignorance, and I know this is really getting out into the pedantry weeds, but that seems like a slightly bizarre post, at best misleading, at worst even wrong.

Why would anyone chose A in that example? Does using pre- and post- increment really result in different behavior for that example in C#? In other words, do these really produce different output:

    for(int i = 0; i < 5; ++i) {
        Console.WriteLine(i);
    }

    for(int i = 0; i < 5; i++) {
        Console.WriteLine(i);
    }

Answers to this question on StackOverflow indicate not: http://stackoverflow.com/questions/484462/difference-between...

It seems like the example might have been supposed to be:

    for(int i = 0; i < 5; ) {
        Console.WriteLine(i++);
    }

Furthermore, is this even correct: "What is the order of operation? Declare, loop body, compare, increment, loop body, compare, increment, .... " Surely for loops in C# are the same in almost every other language, and the comparison happens once before the body is ever executed?

I don't know anything about C#, but I think the suggestion to use one over the other due to performance is pretty poor advice if applied in general. I doubt incrementing an integer is a performance issue in many programs, and if it is you should come to that conclusion after careful profiling. Granted, that post makes the point that based on the C# spec one may be faster than the other, but I still think there are more important things to spend time optimizing.

I like how an off the cuff response to a jokey piece of pseudocode gets decent responses. And people say Hacker News has gone downhill.

I like pre-increment due to the speed aspects as well, but it took ages to break out from the university training of "use post-increment for most situations", which is frankly baffling.

The compiler I am using produces the exact same output for either variation of the aforementioned code. Perhaps it is a good habit to get into if you are jumping between different tools though.

I've always felt it read better too. I mentally say "increment i" for ++i versus "i increment" for i++.