Throttling Data Requests with React Hooks

In this tutorial, we’ll build a React Hook that enables us to gradually load data without blocking the UI of the browser.

When an application loads data, typically, relatively few HTTP requests are made. For example, if we imagine we’re making a student administration application, then a “view” screen might make a single HTTP request to load that student’s data before displaying it.

Occasionally, there’s a need for an application to make a large number of HTTP requests. Consider a reporting application that loads data and then aggregates it for presentation purposes.

This need presents two interesting problems:

  1. How do we load data gradually?
  2. How do we present loading progress to users?

In this tutorial, we’ll demonstrate how to tackle these issues using a custom React Hook.

Let’s bring Chrome to its knees

We’ll begin our journey by spinning up a TypeScript React app with Create React App.

npx create-react-app throttle-requests-react-hook --template typescript

Because we’re going to make a number of asynchronous calls, we’ll simplify the code by leaning on the widely used react-usefor auseAsync hook.

cd throttle-requests-react-hook
yarn add react-use

We’ll replace the App.css file with this:

.App {
  text-align: center;

.App-header {
  background-color: #282c34;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  font-size: calc(10px + 2vmin);
  color: white;

.App-labelinput > * {
  margin: 0.5em;

.App-link {
  color: #61dafb;

.App-button {
  font-size: calc(10px + 2vmin);
  margin-top: 0.5em;
  padding: 1em;
  background-color: cornflowerblue;
  color: #ffffff;
  text-align: center;

.App-progress {
  padding: 1em;
  background-color: cadetblue;
  color: #ffffff;

.App-results {
  display: flex;
  flex-wrap: wrap;

.App-results > * {
  padding: 1em;
  margin: 0.5em;
  background-color: darkblue;
  flex: 1 1 300px;

Then, we’ll replace the App.tsx contents with this:

import React, { useState } from "react";
import { useAsync } from "react-use";
import "./App.css";

function use10_000Requests(startedAt: string) {
  const responses = useAsync(async () => {
    if (!startedAt) return;

    // make 10,000 unique HTTP requests
    const results = await Promise.all(
      Array.from(Array(10_000)).map(async (_, index) => {
        const response = await fetch(
        const json = await response.json();
        return json;

    return results;
  }, [startedAt]);

  return responses;

function App() {
  const [startedAt, setStartedAt] = useState("");
  const responses = use10_000Requests(startedAt);

  return (
    <div className="App">
      <header className="App-header">
        <h1>The HTTP request machine</h1>
          onClick={(_) => setStartedAt(new Date().toISOString())}
          Make 10,000 requests
        {responses.loading && <div>{progressMessage}</div>}
        {responses.error && <div>Something went wrong</div>}
        {responses.value && (
          <div className="App-results">
            {responses.value.length} requests completed successfully

export default App;

The app we’ve built is very simple: it’s a button that, when you press it, fires 10,000 HTTP requests in parallel using the Fetch API. The data being requested in this case is an arbitrary JSON file: the manifest.json. If you look closely, you’ll see we’re doing some querystring tricks with our URL to avoid getting cached data.

In fact, for this demo, we’re not interested in the results of these HTTP requests. Rather, we’re interested in how the browser copes with this approach (spoiler: not well). It’s worth considering that requesting a text file from a server running on the same machine as the browser should be fast.

So we’ll run yarn start and go to http://localhost:3000 to get to the app. Running with Devtools open results in the following unhappy affair:

HTTP Request Machine App Example

The gif above has been edited significantly for brevity. In reality, it took 20 seconds for the first request to be fired. Prior to that, Chrome was unresponsive. When requests did start to fire, a significant number failed with net::ERR_INSUFFICIENT_RESOURCES. Requests that were fired sat in a “Stalled” state prior to being executed. This is a consequence of Chrome limiting the number of connections (all browsers do this):

There are already six TCP connections open for this origin, which is the limit. Applies to HTTP/1.0 and HTTP/1.1 only.

In summary, the problems with the current approach are threefold:

  1. The browser becomes unresponsive
  2. HTTP requests fail due to insufficient resources
  3. The user sees no information related to progress

#react #javascript #programming #developer #web-development

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Throttling Data Requests with React Hooks
Autumn  Blick

Autumn Blick


How native is React Native? | React Native vs Native App Development

If you are undertaking a mobile app development for your start-up or enterprise, you are likely wondering whether to use React Native. As a popular development framework, React Native helps you to develop near-native mobile apps. However, you are probably also wondering how close you can get to a native app by using React Native. How native is React Native?

In the article, we discuss the similarities between native mobile development and development using React Native. We also touch upon where they differ and how to bridge the gaps. Read on.

A brief introduction to React Native

Let’s briefly set the context first. We will briefly touch upon what React Native is and how it differs from earlier hybrid frameworks.

React Native is a popular JavaScript framework that Facebook has created. You can use this open-source framework to code natively rendering Android and iOS mobile apps. You can use it to develop web apps too.

Facebook has developed React Native based on React, its JavaScript library. The first release of React Native came in March 2015. At the time of writing this article, the latest stable release of React Native is 0.62.0, and it was released in March 2020.

Although relatively new, React Native has acquired a high degree of popularity. The “Stack Overflow Developer Survey 2019” report identifies it as the 8th most loved framework. Facebook, Walmart, and Bloomberg are some of the top companies that use React Native.

The popularity of React Native comes from its advantages. Some of its advantages are as follows:

  • Performance: It delivers optimal performance.
  • Cross-platform development: You can develop both Android and iOS apps with it. The reuse of code expedites development and reduces costs.
  • UI design: React Native enables you to design simple and responsive UI for your mobile app.
  • 3rd party plugins: This framework supports 3rd party plugins.
  • Developer community: A vibrant community of developers support React Native.

Why React Native is fundamentally different from earlier hybrid frameworks

Are you wondering whether React Native is just another of those hybrid frameworks like Ionic or Cordova? It’s not! React Native is fundamentally different from these earlier hybrid frameworks.

React Native is very close to native. Consider the following aspects as described on the React Native website:

  • Access to many native platforms features: The primitives of React Native render to native platform UI. This means that your React Native app will use many native platform APIs as native apps would do.
  • Near-native user experience: React Native provides several native components, and these are platform agnostic.
  • The ease of accessing native APIs: React Native uses a declarative UI paradigm. This enables React Native to interact easily with native platform APIs since React Native wraps existing native code.

Due to these factors, React Native offers many more advantages compared to those earlier hybrid frameworks. We now review them.

#android app #frontend #ios app #mobile app development #benefits of react native #is react native good for mobile app development #native vs #pros and cons of react native #react mobile development #react native development #react native experience #react native framework #react native ios vs android #react native pros and cons #react native vs android #react native vs native #react native vs native performance #react vs native #why react native #why use react native

What are hooks in React JS? - INFO AT ONE

In this article, you will learn what are hooks in React JS? and when to use react hooks? React JS is developed by Facebook in the year 2013. There are many students and the new developers who have confusion between react and hooks in react. Well, it is not different, react is a programming language and hooks is a function which is used in react programming language.
Read More:-

#react #hooks in react #react hooks example #react js projects for beginners #what are hooks in react js? #when to use react hooks

Siphiwe  Nair

Siphiwe Nair


Your Data Architecture: Simple Best Practices for Your Data Strategy

If you accumulate data on which you base your decision-making as an organization, you should probably think about your data architecture and possible best practices.

If you accumulate data on which you base your decision-making as an organization, you most probably need to think about your data architecture and consider possible best practices. Gaining a competitive edge, remaining customer-centric to the greatest extent possible, and streamlining processes to get on-the-button outcomes can all be traced back to an organization’s capacity to build a future-ready data architecture.

In what follows, we offer a short overview of the overarching capabilities of data architecture. These include user-centricity, elasticity, robustness, and the capacity to ensure the seamless flow of data at all times. Added to these are automation enablement, plus security and data governance considerations. These points from our checklist for what we perceive to be an anticipatory analytics ecosystem.

#big data #data science #big data analytics #data analysis #data architecture #data transformation #data platform #data strategy #cloud data platform #data acquisition

Gerhard  Brink

Gerhard Brink


Getting Started With Data Lakes

Frameworks for Efficient Enterprise Analytics

The opportunities big data offers also come with very real challenges that many organizations are facing today. Often, it’s finding the most cost-effective, scalable way to store and process boundless volumes of data in multiple formats that come from a growing number of sources. Then organizations need the analytical capabilities and flexibility to turn this data into insights that can meet their specific business objectives.

This Refcard dives into how a data lake helps tackle these challenges at both ends — from its enhanced architecture that’s designed for efficient data ingestion, storage, and management to its advanced analytics functionality and performance flexibility. You’ll also explore key benefits and common use cases.


As technology continues to evolve with new data sources, such as IoT sensors and social media churning out large volumes of data, there has never been a better time to discuss the possibilities and challenges of managing such data for varying analytical insights. In this Refcard, we dig deep into how data lakes solve the problem of storing and processing enormous amounts of data. While doing so, we also explore the benefits of data lakes, their use cases, and how they differ from data warehouses (DWHs).

This is a preview of the Getting Started With Data Lakes Refcard. To read the entire Refcard, please download the PDF from the link above.

#big data #data analytics #data analysis #business analytics #data warehouse #data storage #data lake #data lake architecture #data lake governance #data lake management

Hayden Slater


Validating React Forms With React-Hook-Form

Validating inputs is very often required. For example, when you want to make sure two passwords inputs are the same, an email input should in fact be an email or that the input is not too long. This is can be easily done using React Hook From. In this article, I will show you how.

Required Fields

The most simple, yet very common, validation is to make sure that an input component contains input from the user. React Hook Form basic concept is to register input tags to the form by passing register() to the tag’s ref attribute. As we can see here:

#react-native #react #react-hook-form #react-hook