Isn't this inefficient to call render() method every time a word is written in input field?

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onChange will not fire with delayed state changes and later added components ReactMeteor ,Connect and share knowledge within a single location that is structured and easy to search., By clicking “Accept all cookies”, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy.

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Alternatively, in newer browsers, you can use the bind() method to pass in the proper reference:,A common example is code that adds a series of DOM Elements one at a time. Adding a DOM element is an expensive operation. Code that adds multiple DOM elements consecutively is inefficient and likely not to work well.,Here’s a simple example. Consider this code:

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Never call Hooks from inside a loop, condition or nested function,Only call Hooks from React functional components,Never call a Hook from a regular function

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A component with a render prop takes a function that returns a React element and calls it instead of implementing its own render logic.,More concretely, a render prop is a function prop that a component uses to know what to render.,Here’s where the render prop comes in: Instead of hard-coding a <Cat> inside a <Mouse> component, and effectively changing its rendered output, we can provide <Mouse> with a function prop that it uses to dynamically determine what to render–a render prop.

<DataProvider render={data => (
  <h1>Hello {data.target}</h1>
)}/>
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In addition, having more connected components means that each component is probably reading smaller pieces of data from the store, and thus is less likely to have to re-render after any given action.,In normal rendering, React does not care whether "props changed" - it will render child components unconditionally just because the parent rendered!,useSelector is a hook, so it can't stop renders caused by parent components. An app that only has useSelector everywhere should probably add React.memo() to some components to help avoid renders from cascading all the time.

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The input field is a text input, and event handlers for focus and blur events.,When it gets focused, it will trigger the “onFocus” handler specified in the app,When it gets blurred, it will trigger the “onBlur” handler specified in the app.

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So, in addition to making your code less repetitive (a.k.a. more "DRY") the selector functions created by reselect are far more efficient. This is because reselect will only call the result function (your final function) if any of the input functions return something different than the last time it ran. If the inputs are all the same, it will short-circuit and instead return the result that it computed and stored the previous time.,It's essential to understand that what createSelector returns is still just a selector function that takes the entire application state as an argument and returns the result of the last function. It's just a more efficient function.,Reselect lets us pass any number of other selectors as input functions that will pass their results to what we'll call our "result function." Remember this terminology. When creating a selector using Reselect, you'll always provide one or more input functions but will only write one result function.

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We all begin learning React by writing (these days, functional) components that return something called JSX. We also understand that this JSX is somehow converted into actual HTML DOM elements that show up on the page. The pages update as the state updates, the routes change as expected, and all is fine. But this view of how React works is naive and a source of many problems.,Eventually, I crossed that mountain, too. But then I was hit by something as important and difficult as React itself: rendering.,So, now, we understand that the so-called virtual DOM doesn’t look anything like the real DOM but is a tree of React (JavaScript) objects representing the UI at that point in time.

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Run the code below to install the Faker library, which we’ll use to generate random data to use in our application.,To install the library, run the code below in your terminal.,Let’s create a sample application to demonstrate what happens to your app’s performance and the DOM tree when you try to render a large list of 10,000 records.

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