Optional chaining MUST be used for potentially undefined properties.
Nullish coalescing (??) MUST be used instead of logical OR (||) for default values when 0 or empty string are valid values.
Example (Correct):
const city = user?.address?.city
const count = response.count ?? 0
const name = user.name ?? 'Anonymous'Example (Incorrect):
// 0 would be replaced with 'default'
const value = response.count || 'default'