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Setting the CSS visibility property to hidden in React: Store a boolean value in the state indicating whether the element should be visible. Conditionally set the visibility property in the element's style attribute. For example, style={{visibility: i...

To create a sleep function in React: Define a function that takes a number of milliseconds as a parameter. The function should return a Promise that is resolved after the provided number of milliseconds....

To remove an object from the state array in React: Use the filter() method to iterate over the array. In each iteration, check if the condition is met. Set the state to the new array returned by the filter method....

To set an onClick listener on a link in React: Set the onClick property on the link. Every time the link is clicked, the function we passed to the props will be called....

Using map() method with index in React: Call map() method on array. The function passed to map() method will be called with element and index....

Use the useEffect hook to run react hooks when the component is unmounted. The function we return from the useEffect hook is called when the component is unmounted and can be used for cleanup purposes....

Use the useEffect hook to call a function only once in React. When the useEffect hook is passed an empty dependencies array, it runs only when the component mounts. This is the preferred approach when we have to fetch data when the component mounts....

To replace an object in an array in React state: Use the map() method to iterate over the array. In each iteration, check if a certain condition is met. Replace the objects that meet the condition and return all other objects as is....

Generates the error Functions are not valid as a React child. This may happen if you return a Component instead of from render. There are 2 common reasons: Returning a function reference instead of a component from render. Using React Router routes as...

To find an object in an array in React: Call the find() method on the array and pass it a function. The function should return an equality check for the relevant properties. The find() method returns the first value in the array that satisfies the con...

To detect when the Esc key is pressed in React.js: Add a keydown event listener to the document element. When the user presses a key, check if the key is Esc. If the key pressed is Escape, call a function or run some logic. import {u...

To check if a browser tab has focus using React: Add event listeners for the focus and blur events. If the focus event is fired, the tab has focus. If the blur event is fired, the tab loses focus. import {useE...

To delete query parameters using React Router: Use the useSearchParams hook to get the search parameters for the current location. Use the delete() method to delete each query parameter, such as searchParams.delete('q'). To update the search parameter...

In React, we use the String() function to render boolean values ​​in JSX, for example, h2{string(bool1)}/h2 . By default, boolean values ​​don’t render anything in React, so we have to convert the value to a string in order to render it. exp...

To create an input field in React.js that only contains numbers: Set the input field's type to text . Add an onChange event handler that removes all non-numeric values ​​. Save the input value in a state variable. import { useState } from reactjs...