Console — Node.js Technical Interview Questions & Answers

Console

Console

  • console.log prints. console.error for errors (stderr). console.table for a small array of objects. In production, a logger (pino/winston) is better than log in a hot loop.
  • Trap: console.log(hugeObject) in a request handler thousands of times.

Technical Interview Tip: console.log('marks', marks);

Code Examples for Console

Console — working example

// Console
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));

Console: find user 2, then list names. Say both prints.

How to Explain Console to an Interviewer

console.error vs log?

error goes to stderr log to stdout