Q481. How do lab and field performance measurement differ?
Lab tools run in a controlled environment. Lighthouse gives a synthetic score with TTFB, FCP, LCP, TBT and CLS, which is useful in CI and for reproducible comparisons. Ch...
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Job Interview Questions and Answers Directory
Search and filter frequently asked interview questions across technical, programming, and behavioral domains. Tailor your interview preparation by difficulty for freshers or experienced developers (2,728 available).
Q482. How do you optimise Tailwind for production?
Tailwind's performance story is about generation and delivery. The JIT engine produces only the utilities present in scanned files, so production CSS is typically a few k...
Q483. How do SSR, prerendering and performance options work in SvelteKit?
SvelteKit renders every page on the server by default and then hydrates it on the client, so the first paint is real HTML. You control this per route with page options. e...
Q484. What is Next.js middleware and when should you use it?
Middleware in middleware.ts at the project root runs before a request is completed, on the Edge runtime, and can rewrite, redirect, set headers or return a response direc...
Q485. What are the different types of data binding in Angular?
Angular has several binding forms. Interpolation {{ value }} renders a component property into text. Property binding [property]="expr" sets a DOM property or directive i...
Q486. How does v-model work on a custom component?
v-model on a component is syntactic sugar. In Vue 3, v-model="foo" compiles to passing a modelValue prop and listening for update:modelValue. Inside the child you declare...
Q487. What are the pitfalls of command substitution?
Command substitution captures the stdout of a command as a string. Use `$(cmd)` rather than backticks, which are deprecated and harder to nest. ```bash today=$(date +%F) ...
Q488. How does self work, and what is the difference between class and instance methods?
`self` is the current object. Inside an instance method it is the receiver, inside a class body it is the class, and inside a class method it is the class as well. ```rub...
Q489. What are lazy properties and property observers?
A stored property can run code when it is set or read through observers and modifiers. - `willSet` and `didSet` observe changes to a stored property. `willSet` receives t...
Q490. Compare the scope functions let, run, with, apply and also.
All five run a block with an object in context. They differ in how the object is referenced (`it` or `this`) and what they return (the object or the lambda result). - `le...