Q191. How do you pass an event handler to a component?
You can pass event handlers and other functions as props to child components. The functions can be passed to child component as below, ```jsx function Button({ onClick })...
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Q192. How to prevent a function from being called multiple times?
If you use an event handler such as **onClick or onScroll** and want to prevent the callback from being fired too quickly, then you can limit the rate at which callback i...
Q193. How JSX prevents Injection Attacks?
React DOM escapes any values embedded in JSX before rendering them. Thus it ensures that you can never inject anything that’s not explicitly written in your application. ...
Q194. How do you update rendered elements?
You can update UI(represented by rendered element) by passing the newly created element to ReactDOM's render method. For example, lets take a ticking clock example, where...
Q195. How do you say that props are readonly?
When you declare a component as a function or a class, it must never modify its own props. Let us take a below capital function, ```javascript function capital(amount, in...
Q196. What are the conditions to safely use the index as a key?
There are three conditions to make sure, it is safe use the index as a key. 1. The list and items are static– they are not computed and do not change 2. The items in the ...
Q197. Should keys be globally unique?
The keys used within arrays should be unique among their siblings but they don’t need to be globally unique. i.e, You can use the same keys with two different arrays. For...
Q198. What is the popular choice for form handling?
`Formik` is a form library for react which provides solutions such as validation, keeping track of the visited fields, and handling form submission. In detail, You can ca...
Q199. What are the advantages of formik over redux form library?
Below are the main reasons to recommend formik over redux form library, 1. The form state is inherently short-term and local, so tracking it in Redux (or any kind of Flux...
Q200. Why are you not required to use inheritance?
In React, it is recommended to use composition over inheritance to reuse code between components. Both Props and composition give you all the flexibility you need to cust...