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Updating arrays

$push, $addToSet, $pull, and editing an object inside an array.

By the end: Modify array contents in place, without reading the document first.

1. $push, $addToSet and $pull

   MongoDB array updates: $push to append, $addToSet to append only if absent, $pull to remove matching elements.

2. The positional $ operator

   Update an object inside a MongoDB array with the positional $ operator, which targets the element your filter matched.

• $addToSet vs $pushwrite
• Positional $ operatorwrite
• $pull from every documentwrite