RxJS — Six Operators That you Must Know
Subscribe to Observables in order but only when the previous completes, let me know, then move to the next one. Use this operator when the order is important, for example when you need to send HTTP requests that should be in order. 2. forkJoin —forkJoin is the Promise.all() of Rx. Don’t let me know until all the Observables are complete, then give me all the values at once. ( Array ) First, let’s
🚀 A Comprehensive Guide to Angular onPush Change Detection Strategy
👉 Default Change Detection StrategyBy default Angular uses the ChangeDetectionStrategy.Default change detection strategy. The default strategy doesn’t assume anything about the application, therefore every time something changes in our application, as a result of various user events, timers, XHR, promises, etc., a change detection will run on all components. This means anything from a click event
💪 Managing State in Angular with Mobx
Every developer knows state management is difficult. Continuously keeping track of what has been updated, why, and… Every developer knows state management is difficult. Continually keeping track of what has been updated, why and when, can become a nightmare, especially in large applications. In the Angular world, several solutions can make state management less painful, complicated, and brittle. T
Implement ngModelOptions with RxJS and Custom Form Control in Angular
If you’ve worked with AngularJS, you probably remember the ng-model-options directive. The two most useful options in this directive were the updateOn and the debounce options. For example, if we wanted to update the model only on blur or add a debounce functionality we could write the following code: Unfortunately, Angular has not implemented this feature in the new version. Let’s try to create o
Implementing Auth Guard with Componentless Route in Angular
I see a lot of different implementations of Auth Guards around the web. The implementation is quite simple. In most cases, you will find yourself doing something like this: As you see, we need to repeat the same line of code whenever there is a new protected route. Of course, it’s not the end of the world, but we can do better and not write redundant configuration. Let’s use a componentless route
Unit Test Your ngrx/effects in Angular
Now let’s create the service that will be responsible for fetching the posts from the server. Build the Posts Service — We need to listen to GET_POSTS action, then call our service and based on the response status to do the following thing: If the response is successful, dispatch GET_POSTS_SUCCESS action with the result.If the request fails, dispatch GET_POSTS_FAIL action with the error.These are
RxJS Subjects for human beings
I have already published an article on the subject, but this time I want to take a different approach. The easiest way to understand what Subject is is to re-create one. Let’s create a simple version of Subject . Let’s look at the facts. Subject is both an Observable and Observer Subject is ObservableIt means he has all the operators (map, filter, etc. ) and you can subscribe to him. That’s all yo
Implementing Event Modifiers in Angular
One of my favorite libraries is Vue. There’s a cool feature in this library that I want to steal for my Angular projects — Event modifiers. From the Vue documentation —It is a very common need to call event.preventDefault() or event.stopPropagation() inside event handlers. Although we can do this easily inside methods, it would be better if the methods can be purely about data logic rather than ha
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Introducing the New KeyValuePipe in Angular
Angular 2 Security — The DomSanitizer Service
Using TypeScript Dynamic Imports in Angular
Better Code Organization with Angular DI Multi Option
Querying For The Closest Parent Element in Angular
Optimizing the Performance of Your Angular Application
A Taste of The New Angular HTTP Client
The Power of Selectors in Angular
Querying a Normalized State with RxJS in Angular
Create the toJSON operator in Angular
🎩 Automagically Unsubscribe in Angular