The reason why you can access “out of scope” or “free” variables in ECMAScript is the so-called scope chain. The scope chain is a special property from each execution context. As mentioned several times before, a context object looks at least like: [[scope]] Variable / Activation Object “this” context value Each time you access a … Read more
It depends … The main goal of MVP is to separate complex decision logic from UI code in such a way that both become easier to understand and to maintain. Often another goal is to make the decision logic in the presenter testable. The MVP pattern was described by Fowler in 2004 and he retired … Read more
August 2022: Note that the below is flawed and doesn’t work when moving a movie down the list. I’ve posted a new answer here which fixes this issue. If you use a combination of the position and a timestamp that the user put a movie in a given position rather than trying to maintain the … Read more
It means “code as data” which is a general characteristic of Lisp family. (add 2 3) Just like above string, which is both a list and also a function call. The “Homo” prefix stands for this characteristic.
liftA, liftM, fmap, and . should all be the same function, and they must be if they satisfy the functor law: fmap id = id However, this is not checked by Haskell. Now for Applicative. It’s possible for ap and <*> to be distinct for some functors simply because there could be more than one … Read more
Define Object#as: class Object def as yield self end end And now you can write: def not_sure_this_is_nice_enough_method1 something_complex(a, b, c).as do |obj| a_predicate_check? ? obj.one_more_method_call : obj end end
Each event loop has a microtask queue and a macrotask queue. A microtask is a task that is originally to be queued on the microtask queue rather than a task queue. Refer to https://www.w3.org/TR/html51/webappapis.html#microtask-queue. There are two kinds of microtasks: solitary callback microtasks, such as Promise， and compound microtasks, such as Object.observe, MutationObserver and process.nextTick … Read more
You might find the Experiences of a Blind Computer Scientist a good read. MIT’s Open Courseware would be a good resource for you with the amount of videos/audio they have. Really though, for the core computer-science topics I find it pretty hard to beat some of the better textbooks out there. Some offer digital versions … Read more
This is a completely subjective question. The answer is, “it depends.” It depends on the primary use of your data. If you continually have to reference the nested structure, then it makes sense to represent it that way. And if you never reference the flat representation except when building the nested structure, then why have … Read more
A quick disclaimer: I’m a little shaky on category theory in general, while I get the impression you have at least some familiarity with it. Hopefully I won’t make too much of a hash of this… Does anyone know of a tutorial that starts from category theory and explains IO, state, list monads in those … Read more