MongoDB has a $mul field update operator that allows you to multiply a value by a specific amount.
If the field doesn’t already exist, it is created and its value is set to zero (0) using the same numeric type as the multiplier.
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MongoDB $inc
MongoDB has an $inc field update operator that allows you to increment a value by a specific amount.
You can use positive and negative values (i.e. to increment or decrement the value).
If the field doesn’t already exist, it is created with the specified value.
Continue readingMongoDB $setOnInsert
The MongoDB $setOnInsert field update operator can be used to insert a specific value during an upsert.
If an update operation results in a new document being inserted (i.e. an upsert), then the $setOnInsert operator takes effect, otherwise it has no effect.
MongoDB $max
MongoDB has a $max operator that allows you to update the value of a field only if the specified value is greater than the current value of the field.
In other words, if the $max value is greater than the current value in the document, the $max value is used. Otherwise, the document’s value remains unchanged.
MongoDB $min
MongoDB has a $min operator that allows you to update the value of a field only if the specified value is less than the current value of the field.
In other words, if the $min value is less than the current value in the document, the $min value is used. Otherwise, the document’s value remains unchanged.
MongoDB $pop
In MongoDB, you can use the $pop operator to remove the first or last element from an array.
Use $pop in conjunction with a method such as update() to update the specified document with the change.
Use -1 to remove the first element, and 1 to remove the last.
MongoDB $pullAll
In MongoDB, you can use the $pullAll operator to remove all instances of the specified values from an existing array.
Use $pullAll in conjunction with a method such as update(), updateOne(), or updateMany() to update the specified document/s with the change.
MongoDB $pull
In MongoDB, you can use the $pull operator to remove values from an array.
Use $pull in conjunction with a method such as update() to update the specified document with the change.
MongoDB $addToSet
In MongoDB, the $addToSet operator adds a value to an array unless the value is already present in the array.
It’s similar to the $push operator, except that $push adds the value even if the value is already present.
MongoDB $push
In MongoDB, you can use the $push operator to append a value to an array.
You can use various modifiers to specify the value’s position in the array, the order of the elements in the array, append multiple values, etc.
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