ooop | OOP | Transpiler library
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kandi X-RAY | ooop Summary
Over-engineered object oriented programming.
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QUESTION
My Question, see below, is how to declare STATIC functions and constants of a pre-ES6 class so they can be inherited?
A recap of the present ES6 class and pre-ES6 classes are given prior to the question so we are all using the same conventions.
In post ES6 we can define a static function in a class as follows:
...ANSWER
Answered 2021-May-22 at 16:48How do I create static functions which can be called without an instance, and how do I assign static constants which can be accessed without an instance?
Both methods and constants are just properties of the class (constructor function) object, and are created by assignment:
QUESTION
This is probably a simple question for ppl better at dplyr - I'd like to compute a frequency list of character data in a dataframe:
Toy data:
...ANSWER
Answered 2021-May-01 at 08:12More dplyr - way would be :
QUESTION
I'm building a small program to capture the screen (using X11 MIT-SHM extension) on video. It works well if I create individual PNG files of the captured frames, but now I'm trying to integrate libav (ffmpeg) to create the video and I'm getting... funny results.
The furthest I've been able to reach is this. The expected result (which is a PNG created directly from the RGB data of the XImage file) is this:
However, the result I'm getting is this:
As you can see the colors are funky and the image appears cropped three times. I have a loop where I capture the screen, and first I generate the individual PNG files (currently commented in the code below) and then I try to use libswscale to convert from RGB24 to YUV420:
...ANSWER
Answered 2021-Apr-15 at 23:01Don't use av_image_alloc use av_frame_get_buffer.
(unrelated to your question, But using avcodec_encode_video2 is considered bad practice now and should be replaced with avcodec_send_frame and avcodec_receive_packet)
QUESTION
I've searched Hi and Low through web sites and docs, and I've yet to figure out why Im getting this error. Yes I'm new to node. I thought id ask here as a last resort.
the error I'm receiving is:
...ANSWER
Answered 2021-Apr-12 at 23:02You should introduce early returns in your code so that you don't call res.end multiple times when one of the conditions evaluates to true with your request handler still handling 404:
QUESTION
I am trying to upload image files to a server and creating a random name when doing so. The issue I am having is that sometimes (far too often) it creates the same file name but for files with a different extension.
My code for the upload is below, what I want to do is add a check to make sure the name is not in use but with a different extension.
Example - da4fb5c6e93e74d3df8527599fa62642.jpg & da4fb5c6e93e74d3df8527599fa62642.JPG
...ANSWER
Answered 2021-Apr-07 at 10:29You can use PHP uniqid & rand functions combinedly. In this way you will never get duplicate values.
QUESTION
I am new to javascript and I have problem with an ajax POST to php.
I am trying tosend javascript variables to php via an ajax POST but it doesn't work.
The ajax post is sent but it sends empty POST. I got alert "Error occured ! 202" when trying to save data to bdd.
Thanks in advance for helping me.
here are my javascript and php codes :
...ANSWER
Answered 2021-Mar-07 at 02:18Your problem is here:
var myData = { 'markerId' : mId, 'vendorId' : vId };
The field names don't need to be in quotes
Change it to this and try again:
var myData = { markerId : mId, vendorId : vId };
QUESTION
I added two material app to my app because my futurebuilder needed a context and my provider was not accessible to the other classes i created. is it an acceptable practice???
...ANSWER
Answered 2021-Jan-25 at 09:19The purpose of a MaterialApp widget is to provide a common theme setting based on Material design and configures the root navigator for all of its children widgets.
In order to avoid conflicting, you should only have 1 MaterialApp. In your case, you can call the openBox() method without using the FutureBuilder by calling it within the main() method:
QUESTION
So, I am trying to perform a sort of line-oriented operation on a gz compressed file bigger than available RAM, so reading it first into a string is excluded. The question is, how to do it in rust ( short of gunzip file.gz|./my-rust-program)?
My current solution is based on flate2 and a bunch of buffered readers:
ANSWER
Answered 2021-Jan-18 at 21:40Each "buffer-inducing" step described in the question is necessary here.
- The GZip decoder implementation requires a buffered reader as part of the decoding process. The buffer will be holding compressed data, through which new-line delimitation is not possible due to how GZip works.
- The second
BufReaderwill then be used to identify the line separation pattern and accurately return complete lines of text.
However, there is a shortcut for the first one. The flate2 crate provides read::GzDecoder, which takes a regular reader and automatically employs buffered reading on it.
QUESTION
I'm trying to add a default 404 error page to my Spring app, and I thought it would be nice to add an animate template like that: https://codepen.io/wikyware-net/pen/xywexE
The whole idea is a validation of form and redirection to the error page, if it fails. Basically, redirection works fine, but the problem I have is I can not make the JS part running (the tost doesn't pop up :-/)...
Here's how my error page looks like:
...ANSWER
Answered 2021-Jan-15 at 17:29A couple of notes:
Change your JavaScript reference for your error.js script to this:
QUESTION
The example on the page of std::ref/std::cref shows the use of std::ref/std::cref to pass arguments to std::bind in a way that looks like std::bind is taking arguments by reference, when in reality it takes the all by value.
Looking at that example only, I could also be ignorant about the existence of std::reference_wrapper, and std::ref would just be a function that allows the behavior exhibited by the linked example.
That's what I mean by std::ref works in the title of the question and also in the following.
Mostly for fun I've tried implementing std::ref myself, and I came up with this:
ANSWER
Answered 2021-Jan-09 at 17:30The logic that you're talking about is implemented entirely within std::bind itself. The main functionality it needs from std::reference_wrapper is the fact that it can be "unwrapped" (i.e., you can call .get() on it in order to retrieve the underlying reference). When the call wrapper (i.e. object returned from std::bind) is called, it simply checks whether any of its bound arguments is a std::reference_wrapper. If so, it calls .get() to unwrap it, then passes the result to the bound callable.
std::bind is complicated because it is required to support various special cases, such as recursive binding (this feature is now considered a design mistake), so instead of trying to show how to implement the full std::bind, I'll show a custom bind template that's sufficient for the example on cppreference:
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