Q411. How to convert a string to title case with javascript?
Title case means that the first letter of each word is capitalized. You can convert a string to title case using the below function, ```javascript function toTitleCase(st...
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Q412. 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 })...
Q413. How can you stream responses from a route handler?
Use the Web Streams API (ReadableStream) in a route handler to stream data progressively to the client. This is useful for large payloads or server-sent updates. ```js ex...
Q414. How do you detect if javascript is disabled on the page?
You can use the `` tag to detect whether JavaScript is disabled or not. The code block inside `` gets executed when JavaScript is disabled, and is typically used to displ...
Q415. How do you test App Router components and pages?
Use React Testing Library for components and Jest for unit tests. For full page integration you can use `next-router-mock` or render server components with `@testing-libr...
Q416. What are various operators supported by javascript?
An operator is capable of manipulating(mathematical and logical computations) a certain value or operand. There are various operators supported by JavaScript as below, 1....
Q417. 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. ...
Q418. How to implement optimistic UI with the App Router?
Use client components for local state and immediately update UI optimistically, then call a server action or route handler to persist. On success, revalidate server data;...
Q419. What is a rest parameter?
Rest parameter is an improved way to handle function parameters which allows us to represent an indefinite number of arguments as an array. The syntax would be as below, ...
Q420. How do you choose between Edge and Node runtimes for route handlers?
Use the Edge runtime for low-latency global responses and where Node APIs are not needed. Choose Node (default) when you require native Node modules, filesystem access, o...