A Comparison of Performance between If and Filter Operators in RxJS

Question

A Comparison of Performance between If and Filter Operators in RxJS

Let's take a look at an example using RxJS.

Type X: [utilizing filter]

this.userService.afAuth.authState
      .pipe(filter(user => !!user))
      .subscribe( _ => this.router.navigate(["/anything"]) )

Type Y: [utilizing if statement]

this.userService.afAuth.authState
      .subscribe( user => {
        if(!!user) this.router.navigate(["/anything"])
       })

Question 1: How can we evaluate the performance of these two approaches?

Question 2: Which method is recommended and for what reasons?

javascript typescript rxjs

Answer 1

Answer №1

Q1: How can we evaluate performance?

To test performance, you can utilize the website https://jsperf.com/. In general, "Type B" is likely to perform better due to fewer function calls required. This difference becomes noticeable when the function is called frequently (e.g., around 10,000 times per second). However, for most everyday scenarios, the performance gap may not be significant.

Q2: Which option is advisable and why?

Considering design aspects, "Type A" is typically recommended. It offers a more declarative syntax, making it easier to replace or reuse in different contexts. For instance, you could extract the filter pipe into a reusable component that can be employed multiple times. If the criteria for filtering changes, you would only need to modify it once within the reusable component.

Answer 2

Q1: How can we evaluate performance?

To test performance, you can utilize the website https://jsperf.com/. In general, "Type B" is likely to perform better due to fewer function calls required. This difference becomes noticeable when the function is called frequently (e.g., around 10,000 times per second). However, for most everyday scenarios, the performance gap may not be significant.

Q2: Which option is advisable and why?

Considering design aspects, "Type A" is typically recommended. It offers a more declarative syntax, making it easier to replace or reuse in different contexts. For instance, you could extract the filter pipe into a reusable component that can be employed multiple times. If the criteria for filtering changes, you would only need to modify it once within the reusable component.

A Comparison of Performance between If and Filter Operators in RxJS

Answer №1

Similar questions

The argument passed cannot be assigned to the parameter required

Issues with looping in Internet Explorer 8

updating the state value through an onChange event in the input field requires taking action by clicking outside the field

The datatable fails to render after executing a function in AngularJS

Are you experiencing issues with the .submit() function when used in conjunction with other

Tips for expanding interfaces/classes during variable declaration

BrowserSync Failing to Load

Implement a jQuery loop that utilizes the fadeIn effect

Matching the appropriate data type for interface attributes

Separate the object/variable from the asynchronous function

Why is it that a JSX element can take a method with parentheses or without as its child?

Persuade TypeScript to trust that all necessary keys will be present in an object

Having trouble with loading nested state in ui-router

Utilizing npm packages with grunt: A guide

Unable to retrieve response token from form in a Next.js/React application utilizing Cloudflare Turnstile

creation of cascading drop-down lists

I possess a single input field and I am seeking to have the focus shifted to it upon the activation of a button

define a variable within a v-for loop

Express receiving undefined data in Ajax POST request

Steps to set Option one as the selected value following a click event or an onClick function: