摘要： 【Mark-and-sweep algorithm】 This algorithm reduces the definition of "an object is not needed anymore" to "an object is unreachable". 从"an object is no 阅读全文

摘要： 【Closures】 A closure is a special kind of object that combines two things: a function, and the environment in which that function was created. Just like block in Objective-C.But Objective-C Block is more weird, cause Block contains a distinctterminology between copy & retain. Here's a slight 阅读全文