Q571. How do I modify the url without reloading the page?
The `window.location.href` property will be helpful to modify the url but it reloads the page. HTML5 introduced the `history.pushState()` and `history.replaceState()` met...
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Q572. When and how often does React invoke the setup and cleanup functions inside a useEffect hook?
1. **Setup Function Execution (`useEffect`)** The setup function (or the main function) you pass to `useEffect` runs at specific points: 1. **After the component is mount...
Q573. How do you check whether or not an array includes a particular value?
The `Array#includes()` method is used to determine whether an array includes a particular value among its entries by returning either true or false. Let's see an example ...
Q574. What happens if you return a Promise from useEffect??
You should NOT return a Promise from useEffect. React expects the function passed to useEffect to return either nothing (undefined) or a cleanup function (synchronous fun...
Q575. How do you compare scalar arrays?
You can use length and every method of arrays to compare two scalars (compared directly using `===`) arrays. The combination of these expressions can give the expected re...
Q576. Can you have multiple useEffect hooks in a single component?
Yes, multiple useEffect hooks are allowed and recommended when you want to separate concerns. ```jsx useEffect(() => { // Handles API fetch }, []); useEffect(() => { // H...
Q577. How to get the value from get parameters?
The `new URL()` object accepts the url string and `searchParams` property of this object can be used to access the get parameters. ```javascript let urlString = "http://w...
Q578. How to prevent infinite loops with useEffect?
Infinite loops happen when the effect updates state that’s listed in its own dependency array, which causes the effect to re-run, updating state again and so on. **Infini...
Q579. How do you print numbers with commas as thousand separators?
You can use the `Number.prototype.toLocaleString()` method which returns a string with a language-sensitive representation such as thousand separator, currency etc. of th...
Q580. What are the usecases of useLayoutEffect?
You need to use `useLayoutEffect` when your effect **must run before the browser paints**, such as: * **Reading layout measurements** (e.g., element size, scroll position...