formal | Elegant form management primitives for the react hooks era | Frontend Utils library

Problem: I have a set of Threads some of which must take a priority to other in acquiring ReentrantLock.

The solution: I can imagine to have a fair ReentrantLock with 2 Condition queues: lowPriority and highPriority. The point is highPriority is signalled before lowPriority. Taking into account fairness of ReentrantLock it must happen that Threads blocked in highPriority always go ahead of Threads blocked on lowPriority.

Implementation:

I usually hear the term vectorized functions in one of two ways:

• In a very high-level language when the data is passed all-at-once (or at least, in bulk chunks) to a lower-level library that does the calculations in faster way. An example of this would be python's use of numpy for array/LA-related stuff.
• At the lowest level, when using a specific machine instruction or procedure that makes heavy use of them (such as YMM, ZMM, XMM register instructions).

However, it seems like the term is passed around quite generally, and I wanted to know if there's a third (or even more) ways in which it's used. And this would just be, for example, passing multiple values to a function rather than one (usually done via an array) for example:

It is my code in which I get the subcategories' names. But the problem is it shows data in an array form.

So I have a custom programming language, and in it I am doing some math formalization/modeling. In this instance I am doing basically this (a pseudo-javascript representation):

The note below the PerformEval abstract operation says:

The eval code cannot instantiate variable or function bindings in the variable environment of the calling context that invoked the eval if the calling context is evaluating formal parameter initializers or if either the code of the calling context or the eval code is strict mode code. Instead such bindings are instantiated in a new VariableEnvironment that is only accessible to the eval code. Bindings introduced by let, const, or class declarations are always instantiated in a new LexicalEnvironment.

Question:

What is meant by "if the calling context is evaluating formal parameter initializers"? What is a "parameter initializer"?

There is only one other reference to the term "parameter initializer" in the spec in Note 3 of 9.2.10. This note says:

Parameter Initializers may contain direct eval expressions. Any top level declarations of such evals are only visible to the eval code (10.2). The creation of the environment for such declarations is described in 14.1.22.

I interpreted this as meaning that if a parameter initializer expression contains an eval call, then any variables created inside that eval call are not instantiated in the parameter scope. So, in the example below, I was expecting a ReferenceError to be thrown since c shouldn't be instantiated in the parameter scope:

So I have a pretty simple dynamic programming solution to the "longest increasing subsequence" problem (find the longest subsequence of increasing elements in a given sequence, for instance for [1, 7, 2, 6, 4] it would be [1, 2, 4]), which can also find the actual subsequence (as opposed to just lenght):

I trying to extract all arguments and their default options from a function (randomForestSRC::rfsrc) to integrate it within another function. This is what I'm doing:

I have such a properties file:

I am trying to implement infinite scrolling for documents stored in a MongoDB collection. Every document is a restaurant that has a numeric field rating, so I am using the rating field for sorting and showing restaurants with the highest rating first.

The problem is that the collection of the restaurants is not static. The ratings of the restaurants change in real time, therefore the order of the restaurants in the collection changes constantly. As a result, although I formally have the sorting key, it does not make much sense.

I am thinking of 2 solutions of the problem:

1. Accept that the order of the restaurants may change slightly while someone is doing the infinite scrolling. Make the front end responsible for getting rid of possible duplicates. Accept that some of the restaurants may not appear during a scrolling at all. But that looks more like working around the problem instead of solving it.
2. Only perform infinite scrolling against a static copy of the collection of restaurants. Update the static copy periodically (e.g., once a day) with the rating updates. But this approach seems overengineered. Also, what happens with the infinite scrolling at the moment when the static copy of the restaurants gets updated with the new ratings? Such scrolling will be broken as well because the problem with the changing order is still here, the order just does not change that frequently.

I am sure I am far not the first one who have faced this problem. After all, there are a lot of examples of infinite scrolling implementations out there, like Facebook or Instagram feeds. At the same time, all the articles I have read so far seem too superficial and covering only cases with infinite scrolling through static collections.

What is the right approach to deal with infinite scrolling for a collection that may change its order any time?

Thank you.