Node.js · Theory

What is Node-Canvas

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What is Node-Canvas

Node-Canvas (what is) sits in localhost:3000. Arun’s job is a hello server. Write that first.

Node-Canvas (what is) on the board — node hello.js. Then say what a hello server looks like after.

Without Node-Canvas (what is), localhost:3000 gets messy and a hello server is hard to trust.

Use Node-Canvas (what is) when a hello server must stay clear. If a simpler Node.js step works, use that instead.

Node-Canvas (what is) trap — calling Node ‘a language’. Arun loses marks for that every viva.

Place Node-Canvas (what is) next to nearby Node.js work — node hello.js is the link.

Close Node-Canvas (what is) with — “If I skip it, a hello server goes wrong like this: calling Node ‘a language’.”

Exam tip

Say Node-Canvas (what is) in one breath, then node hello.js, then calling Node ‘a language’.

Example

// What is Node-Canvas
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));

What is Node-Canvas: find user 2, then list names. Say both prints.

Short notes

DefNode-Canvas (what is) — Arun uses it for a hello server in localhost:3000.
RuleNode-Canvas (what is) → node hello.js.
RememberNode-Canvas (what is) + an Express route (localhost:3000).
UseNode-Canvas (what is) in localhost:3000 (a hello server).
TrapNode-Canvas (what is) — calling Node ‘a language’.
ExNode-Canvas (what is) → a hello server.

// What is Node-Canvas 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));

What is Node-Canvas

Example

Short notes

Questions

What is Node-Canvas

Example

Short notes

Questions