Q121. What is the purpose of the array slice method?
The `slice()` method in JavaScript is used to extract a section of an array, returning a new array containing the selected elements. It does not modify the original array...
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Q122. How to create components in React?
Components are the building blocks of creating User Interfaces(UI) in React. There are two possible ways to create a component. 1. **Function Components:** This is the si...
Q123. What is the difference between gross margin and net margin?
Gross margin is revenue minus cost of goods sold, divided by revenue. It measures how much is left after the direct costs of delivering what you sell, such as materials, ...
Q124. What are DAU, MAU and the stickiness ratio?
DAU is daily active users, the number of unique users who perform a meaningful action in a day. MAU is the same over a month. The action must be defined consistently: a l...
Q125. How do lazy loading and code splitting improve performance?
Lazy loading defers work until it is needed. For images, loading="lazy" and decoding="async" defer off-screen loads, but never lazy-load the LCP image because it delays t...
Q126. How do slots and component composition work in Svelte?
Slots let a parent pass markup into a child. A default slot is placed with slot in the child and any children of the parent's component tag fill it. Named slots use slot ...
Q127. What are Route Handlers and how do they differ from API Routes?
Route Handlers live in app/api/.../route.ts and export HTTP-method functions such as GET, POST, PUT, DELETE and PATCH. They receive a standard Request and return a Respon...
Q128. Tell me about a time you had to learn something quickly.
Show a learning system, not just a story. Example: "We inherited a Go service with no tests and I had never written Go. I gave myself three days: I read the standard libr...
Q129. What is PL/SQL, and how is it different from SQL?
**PL/SQL** = Procedural Language extensions to SQL (Oracle-specific). It adds variables, loops, IF-ELSE, and exception handling. | SQL | PL/SQL | |-----|--------| | Singl...
Q130. What is the purpose of the array splice method?
The `splice()` method in JavaScript is used to add, remove, or replace elements within an array. Unlike `slice()`, which creates a shallow copy and does not alter the ori...