Node.js · Theory

console.error()

Theory

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console.error()

console.error() (function) is simple if you keep it on paper. Sara uses it for a console.error function dry-run in a campus project.

Keep console.error() (function) small. Sara should finish a console.error function dry-run in a few lines, not a 40-line dump.

Skip console.error() (function) and skipping the failure case for console.error function shows up in a campus project.

Use console.error() (function) when a console.error function dry-run must stay clear. If a simpler Node.js step works, use that instead.

console.error() (function) trap: skipping the failure case for console.error function. Sara loses marks for that every viva.

Place console.error() (function) next to nearby Node.js work — one console.error function step Sara can write from memory is the link.

One breath for console.error() (function), then a console.error function dry-run, then skipping the failure case for console.error function. Sit down.

Exam tip

For console.error() (function): definition + a campus project + one failure.

Example

// console.error()
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.error(): find user 2, then list names. Say both prints.

Short notes

Defconsole.error() (function) — Sara uses it for a console.error function dry-run in a campus project.
Ruleconsole.error() (function) → one console.error function step Sara can write from memory.
Rememberconsole.error() (function) + the event loop (a campus project).
Useconsole.error() (function) in a campus project (a console.error function dry-run).
Trapconsole.error() (function) — skipping the failure case for console.error function.
Exconsole.error() (function) → a console.error function dry-run.

// console.error() 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.error()

Example

Short notes

Questions

console.error()

Example

Short notes

Questions