How to create database in MongoDB?

mongodb for loop insert update

This for loop is working and updating all records using mongodb loop and the example as given below.

//Find Items from collection.

var items = db.collection.find(),  i = 0;

//For-each loop execution.

items.forEach(function(item){
    db.collection.update(
            {_id: item._id},
             {$set:{new_field:i}
    });
   $i++;
});

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