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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....

Adding types to the useRef hook might be a little confusing at first, let’s look at why that is: import {useEffect, useRef} from react ; export function RefDemo () { const inputRef = useRef (); useEffect ( () = { inputRef. current . fo...

To qualify the useState hook object in React, use the hook's generic type, for example, const [employee, setEmployee] = useState{name: string; salary: number}({name: ,salary: 0}) . The state variable will only accept key-value pairs of the specified t...

Use the textDecoration property to add a strikethrough to text in React, for example, span style={{textDecoration: line-through}} . The text-decoration CSS property sets the appearance of text decoration lines. const App = () = { return ( div h2 span ...

To go back to the previous page with React Router: Use the useNavigate() hook, e.g. const navigate = useNavigate(); . Calls the navigate() function passed to it -1 - navigate(-1) . Calling navigate with -1 is the same as clicking the back button. impo...

To open a file input on button click in React: Set the onClick attribute on the button element. Set the ref attribute on the file input. When the button is clicked, open the file input, e.g. inputRef.current.click() . App.js import { useRef } from...

To cross out text on click in React: Set an onClick attribute on the element. When the element is clicked, check if its text-decoration attribute is set. If the attribute is set, remove it, otherwise set it to line-through. const App =...

Use spread syntax to combine multiple inline style objects in React, for example style={{...style1, ...style2}} . The spread syntax will unpack the key-value pairs of the object into a final object and the styles will be applied to the element. export...

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...