r-ninja | R语言忍者秘笈

I am trying to implement a jquery function to diable submit button till all values are filled please help as I seem not to find a solution to it..Where am I going wrong?

Here is the html:

I'm implementing some search and filtering controls with Angular. I've started using RxJs for this. First I had really bad time trying to understand operators like switchMap and exauhstMap, so I referred to this video and this article. Now I have better understanding of it. But a question popped up on my mind regarding using debounceTime() with switchMap(). Is it a common practice? Why do I need a debounceTime when switchMap will make sure to cancel all previous requests?

So if I'm implementing a search box like Google's, would I need to use both?

I am making a game using Phaser 3, specifically the Matter physics engine. I am trying to follow this tutorial on fling physics https://www.emanueleferonato.com/2019/03/08/fling-unity-game-built-in-html5-with-phaser-and-matter-js-updated-with-the-latest-constraints-tweaks-fly-through-the-screen-with-your-ninja-rope/

I was playing around with the switchMap operator to clearly understand what was happening to a "switched" inner observable.

At first i thought that switchMap was only "unsubscribing" from the switched inner observable, but then i realize it was in fact "unsubscribing AND completing" the inner observable.

To confirm that i've written this small snippet: https://codesandbox.io/s/relaxed-meninsky-c5jmw?fontsize=14

As you can see, the finalize() operator is correctly called when the subject emit for the second time, but:
why does the complete handler of the tap operator is not called ?

This somehow make feel only 80% happy with my understanding of this operator.

A related not on that:
I've read and watch numerous sources regarding switchMap, including:

• This (great) ngconf sources: https://medium.com/@shairez/a-super-ninja-trick-to-learn-rxjss-switchmap-mergemap-concatmap-and-exhaustmap-forever-88e178a75f1b
• The official rxjs doc: https://rxjs-dev.firebaseapp.com/api/operators/switchMap

And none of them clearly state if inner observable is unsubscribed or unsubcribed AND closed ( or at least i did not understand it :) )

I've watched the switchMap operator source code and there is no mention to takeXXX operator, how can he complete the inner operator without that ?

tl;dr

• Do you confirm that switchMap complete inner observable when switching ?
• Why does tap operator does not work as expected ?
• If switchMap effectively complete inner observable how can he do that without using a takeXXX operator internally ?

Good evening everyone, I am creating my first basic web application and I have problems with the frontend, I am not very good with this topic. I have a problem with my css html code. I have 2 menus a sidebar and a navbar I want to get my menu (sidebar) to be positioned on the left side but I can't get close to that effect. I leave a photo so you can see how I want the menu to look

I am trying to create a UserProfile model in my user app and instead of inheriting from models.Model, I am inheriting from django's own User model so that I would have a custom user model wwith extra fields. But when I run the python manage.py test command it gives me the following error:

Hello dear developers!

I am new to Vue.js and I am struggling now on one visual issue. While navigating the user from navbar to the previous page via Login where go_login() =

go_login: function () { this.$router.push('/login') }

the page routes to the login component but the height of the page do not update. This does not happen if you use href="/login" instead or type the adress directly in the browser adress bar but i do not want (would not like) to use href.

What am I missing?

My code:

router/index.js