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Node.js · Theory

Crypto

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Theory

15/723

Crypto

Crypto is simple if you keep it on paper. Sara uses it for Sara walking through Crypto in lab hour.

Keep Crypto small. Sara should finish Sara walking through Crypto in a few lines, not a 40-line dump.

Skip Crypto and copy-pasting Crypto without a dry-run shows up in lab hour.

Sara ships Crypto in lab hour. That is the use case worth saying.

If Sara walking through Crypto breaks under Crypto, check copy-pasting Crypto without a dry-run first.

After Crypto, Sara should still remember copy-pasting Crypto without a dry-run.

Viva for Crypto: what it is → one Crypto step Sara can write from memory → the mistake (copy-pasting Crypto without a dry-run).

Exam tip

Say Crypto in one breath, then one Crypto step Sara can write from memory, then copy-pasting Crypto without a dry-run.

Example

// Crypto
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));

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

Short notes

  • DefCrypto — Sara uses it for Sara walking through Crypto in lab hour.
  • RuleCrypto → one Crypto step Sara can write from memory.
  • RememberCrypto + an Express route (lab hour).
  • UseCrypto in lab hour (Sara walking through Crypto).
  • TrapCrypto — copy-pasting Crypto without a dry-run.
  • ExCrypto → Sara walking through Crypto.

Questions

1

What is Crypto? Teach it with Sara walking through Crypto.

2

Where does Crypto show up in lab hour?

3

Which mistake makes Sara walking through Crypto fail?

4

Dry-run one Crypto step Sara can write from memory and say the result.

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