MongoDB · question
Q.07 of 52
Explain the difference between find() and findOne() methods.
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Re-explain
find():
- Returns a cursor to all matching documents
- Returns multiple documents
- Lazy evaluation - documents loaded as needed
- Can be chained with other methods
findOne():
- Returns the first matching document
- Returns a single document object or null
- Immediately executes and returns result
- Cannot be chained with cursor methods
// find() - returns cursor
const cursor = db.users.find({age: {$gte: 25}})
cursor.forEach(doc => print(doc.name))
// findOne() - returns document
const user = db.users.findOne({email: "john@email.com"})
if (user) {
print(user.name)
}
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