hsbt

2013 年の新卒研修メニュー

Rails Tutorial

目的

• 2013 年にモダンな方法で一通り Web アプリケーションを自分一人で作れるようになってもらう
• 作る過程で Web 開発で必要とされるアプリケーションレイヤのスキルセットを身につけてもらう

教科書

hellerbarde

Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns
L2 cache reference ........................... 7 ns
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns             
Compress 1K bytes with Zippy ............. 3,000 ns  =   3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns  =  20 µs
SSD random read ........................ 150,000 ns  = 150 µs

Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs

dhoerl

When I posted this on Apple’s Cocoadev listserver, I never did get pointers to code to convert a NSDictionary to a binary formatted plist, but did get pointers to look at NSPropertyListSerialization - something I had already (mis)read a few times.

The description for the dataFromPropertyList class method seems confusing if you don't understand that you can create a property list with no keys: that is, you can create one with a single compliant object, and the key becomes "root".

So, in the unlikely event that some else someday has the same mental block, here is actual tested code that takes a NSDictionary and creates a binary plist file:

   NSDictionary *dict;
    char *payload = "This is the payload";
    
    dict = [NSDictionary dictionaryWithObjectsAndKeys: