# MongoDB update documents

# $set operator
{ "$set": { "status": "modified" } }
{ "$set": { "name": "Alice", "age": 31 } }

# $unset operator
{ "$unset": { "middleName": "" } }

# $inc operator
{ "$inc": { "count": 1 } }
{ "$inc": { "count": -1, "version": 1 } }

# $mul operator
{ "$mul": { "price": 1.1 } }

# $rename operator
{ "$rename": { "nmae": "name" } }

# $min and $max
{ "$min": { "lowScore": 150 } }
{ "$max": { "highScore": 950 } }

# $currentDate
{ "$currentDate": { "lastModified": true } }

# $setOnInsert
{ "$setOnInsert": { "defaultValue": 0 } }

# Combined update operators
{ "$set": { "status": "active" }, "$inc": { "loginCount": 1 } }
{ "$set": { "name": "Bob" }, "$unset": { "temp": "" }, "$inc": { "version": 1 } }

# Array update operators
{ "$push": { "tags": "newTag" } }
{ "$pull": { "tags": "oldTag" } }
{ "$addToSet": { "tags": "uniqueTag" } }
{ "$pop": { "scores": 1 } }
{ "$pop": { "scores": -1 } }

# Nested update
{ "$set": { "address.city": "Boston", "address.state": "MA" } }