Arranging Pipe Methods in RxJS/Observable for Optimal Functionality

In the class Some, there is a method called run that returns an Observable and contains a pipe within itself. Another pipe is used when executing the run method.

import { of } from 'rxjs'; 
import { map, tap, delay } from 'rxjs/operators';

class Some {
  run() {
    return of('Some request').pipe(
      tap((res) => {
        console.log('First -> ', res);
      })
    );
  }
}

new Some().run().pipe(
  map(res => console.log(`Second -> ${res}`))
).subscribe();

The console output will be:

First -> Some request

Second -> Some request

Now my concern is: I need to perform some operations within the method after this pipe -> new Some().run().pipe() has finished. With reference to this example, I aim for the following console output:

first:

Second -> Some request

and then

First -> Some request

Answer №1

If you want to pass the mapping function to the execute method, simply do so like this:

  execute(mappingFunction: (Observable<any>) => Observable<any>) {
    return of('Some data').pipe(
      map(result => mappingFunction(result)),
      tap(console.log)
    );
  }

This concept can be applied to any function that you wish to pass to an RxJS operator.

Answer №2

To utilize an operator function as a parameter for execution, you can pass it to the run method:

run(operator) {
  return of('Some request').pipe(
    operator,
    tap((res) => {
      console.log('First -> ', res);
    })
  );
}

run(input$ => input$.pipe(tap(v => console.log(v, “second”))).subscribe()

Similar questions

If you have not found the answer to your question or you are interested in this topic, then look at other similar questions below or use the search

Tips for transferring data when clicking in Angular 5 from the parent component to the child component

I need assistance with passing data from a parent component to a child component in Angular 5. I want the child component to render as a separate page instead of within the parent's template. For example, let's say my child component is called & ...

Websites experiencing horizontal scrolling functionalities

I have noticed that in my angular project, the website becomes horizontally scrollable when I log in. This only happens after logging in, and does not occur beforehand. I'm using angular calendars and Bootstrap for styling. What could be causing this ...

How can you connect one data field to another within Angular?

Angular offers a convenient method for binding the value of an HTML element to a data field. For example, you can achieve this with the following code: <input name="firstName" [(ngModel)]="firstName"/> This means that any text en ...

Tips for including new items in an array within a subscribe valueChanges in Angular

What is the process for extracting values from a reactive form and storing them in an array when the form is valid? My application features dynamic forms with various fields that appear dynamically. retrieveFormValues(){ let valuesArray = []; this.fo ...

Is it feasible to obtain the userId or userInfo from the Firebase authentication API without requiring a login?

Is it feasible to retrieve the user id from Firebase authentication API "email/password method" without logging in? Imagine a function that takes an email as a parameter and returns the firebase userId. getId(email){ //this is just an example return t ...

What are the limitations of using useState with complex nested objects and arrays in React components?

In my scenario, I am working with an array of characters. Each character contains multiple builds, and each build includes a string for weapons and a string for artifacts. I am developing a tool to extract specific portions of these strings and assign them ...

Measuring the height of an element within its parent component using Angular 4

Check out my demo here I've created a basic parent component along with a child component. Is there a way to retrieve the height of the parent div from within the child component? import { Component, Input, ElementRef, OnInit, ViewChild } from &apo ...

A method for setting values independently of [(ngModel)] within an *ngFor loop and selecting an HTML tag

I am encountering an issue with [(ngModel)], as it is syncing all my selections to the same variable. My variable is selectStations = []; Therefore, when I choose an option in one select element, it updates all select elements to have the same selected o ...

"An error has occurred stating that the header is not defined in

It is a coding issue related to payment methods. The headers type is undefined in this scenario, and as a newcomer to typescript, pinpointing the exact error has been challenging. An error message is indicating an issue with the headers in the if conditio ...

Steps for creating an Angular project and deploying it to the server

After integrating Angular Universal into my project, I noticed that two new files called 'browser' and 'server' were generated during the build process. However, I am unsure of how to properly upload these new files to the server compar ...

Adaptable Style Properties Adjusted by Component Size

Check out this awesome React Native component: const CustomView = (props) => { return ( <View style={{ maxHeight: "100%", width: "100%", aspectRatio: 2, borderWidth: 10, borderCo ...

What are the steps to get started with AngularJS 2?

When starting an Angular 1.XX project, we typically use the following code to bootstrap: ng-app ="myApp" Then in our Javascript file, we set up our app like so: var app = angular.module('myApp',[]); But how do we go about bootstrapping in Ang ...

Enforce Immutable Return in TypeScript

Hello, I am curious to know if there is a way to prevent overwriting a type so that it remains immutable at compile time. For example, let's create an interface: interface freeze{ frozen: boolean; } Now, let's define a deep freeze function: f ...

The usage of @Inject('Window') in Angular/Jasmine leads to test failures, but removing it results in code failures

Currently, I am encountering a dilemma related to using Angular's @Inject('Window') within a web API service. This particular issue arises when the Window injection is utilized in the service constructor, leading to test spec failures in the ...

Steps to modify the background color of an IconButton upon clicking in Material UI

After clicking on the IconButton, the background color changes to an oval shape. I now need to modify the background color when it is clicked. CSS The CSS code for the IconButton changes the background color upon hover. I require a similar effect for the ...

Webpack, TypeScript, and modules are set to "esnext," resulting in a change to undefined

In my setup, I am using webpack with typescript (via ts-loader). To enable code splitting in webpack, it is necessary to adjust the module setting to esnext in the tsconfig file: // tsconfig.json { "compilerOptions": { "module": ...

Change validators dynamically according to conditions

Scenario: At the start, there is a single text box named Name1, a date picker called DOB1, and a check box labeled Compare. Both Name1 and DOB1 are mandatory. When the checkbox is clicked, two new form controls are dynamically included, named Name2 and DO ...

Using typescript with create-react-app - organizing types in a separate file

I'm currently developing a project using Create React App with TypeScript (create-react-app myapp --typescript) In my App.tsx file, I have written some TypeScript code that I want to move to an external file. I have tried creating App.d.ts, index.d.t ...

Error: Could not locate application for Ionic Serve command

I have been developing a project in Ionic2 on another computer. However, when I try to run ionic serve on my PC, an error message appears: 192.168.1.100:8100 Application not found I have configured my app to use a static IP address... How can I resolve ...