Install on Linux — Node.js Technical Interview Questions & Answers

Install on Linux

Install on Linux

  • Node.js runs JavaScript on the server (and in scripts), not only in the browser. Chrome’s V8 engine + an event loop. You write hello.js, run node hello.js, and it prints. No Apache required for a tiny API.
  • It is not a new language. It is JavaScript plus modules like fs, http, path. npm installs extra packages. Good for APIs, tooling, realtime chat. CPU-heavy number crunching can block the event loop — offload it.
  • Trap: ‘Node is a language’. Trap: ‘Node replaces the browser’. The browser still runs JS for pages. Node runs JS on the machine.
hello.js
     │ node
     ▼
   V8 + event loop
     │
     ▼
  console / HTTP

Technical Interview Tip: JS on the server. node hello.js. Not a new language.

Code Examples for Install on Linux

Install on Linux — working example

// Install on Linux
const users = [
  { id: 1, name: "Asha" },
  { id: 2, name: "Ravi" },
];

function findUser(id) {
  return users.find((u) => u.id === id) ?? null;
}

console.log(findUser(2));
console.log(users.map((u) => u.name));

Install on Linux: find user 2, then list names. Say both prints.

How to Explain Install on Linux to an Interviewer

What is Node.js?

JavaScript runtime outside the browser node file.js

Why event loop?

Non-blocking I/O for APIs Don’t block it with heavy CPU