MongoDB provides a number of aggregation pipeline operators for working with dates, including operators that extract certain parts of dates, such as the year, month, day, etc.
There are also a couple of MongoDB methods that enable you to iterate through a cursor, and apply a JavaScript function. You can therefore use JavaScript to extract date values and date parts, etc from a field as required.
This article presents 5 ways to return the month portion from a date in MongoDB.
Continue readingMongoDB provides quite a few aggregation pipeline operators for working with dates. This includes operators that extract certain parts of dates, such as the year, month, day, etc.
There are also a couple of MongoDB methods that enable you to iterate through a cursor, and apply a JavaScript function. This therefore allows you to use JavaScript to extract date values and date parts, etc from a field.
This article presents 6 ways to return the year portion from a date in MongoDB.
Continue readingThis article contains a list of date operators, methods, and variables that you can use when working with dates in MongoDB.
Continue readingIn MongoDB, the $toUpper aggregation pipeline operator converts a string to uppercase and returns the result.
In MongoDB, the $toLower aggregation pipeline operator converts a string to lowercase and returns the result.
In MongoDB, you can use the $exists element query operator to match documents that contain a specific field.
You can also use it to match documents that don’t contain a specific field.
You can also use it in conjunction with other operators such $nin to match documents where a given field exists, but it doesn’t contain a specific value.
In MongoDB, the cursor.forEach() method iterates the cursor to apply a JavaScript function to each document from the cursor.
In MongoDB, the cursor.map() method applies a function to each document visited by the cursor and combines the return values in an array.
From MongoDB 4.4, you can use the $isNumber aggregation pipeline operator to check whether or not a value is a number.
It accepts any valid expression, and returns true if the expression is a number, false if it’s not.
The $replaceAll aggregation pipeline operator was introduced in MongoDB 4.4.
This operator replaces all instances of a search string in an input string with a replacement string and returns the result.
If the search string isn’t found, then $replaceAll returns the input string.