In MongoDB, the $cond aggregation pipeline operator evaluates a boolean expression, and returns one of the two specified return expressions, depending on whether the boolean expression is true or false.
The $cond operator accepts two syntaxes: a longhand syntax and a shorthand syntax. Examples of each are below.
In MongoDB, the $concatArrays aggregation pipeline operator concatenates two or more arrays and returns the concatenated array.
In MongoDB, the $concat aggregation pipeline operator concatenates two or more strings and returns the concatenated string.
In MongoDB, the $cmp aggregation pipeline operator compares two values and returns either -1, 1, or 0, depending on whether the first value is less than, greater than, or equal to the first value.
In MongoDB, the $floor aggregation pipeline operator returns the largest integer less than or equal to the specified number.
$floor accepts any valid expression that resolves to a number.
In MongoDB, the $ceil aggregation pipeline operator returns the smallest integer greater than or equal to the specified number.
$ceil accepts any valid expression that resolves to a number.
In MongoDB, the $sqrt aggregation pipeline operator calculates the square root of a positive number and returns the result as a double.
$sqrt accepts any valid expression that resolves to a non-negative number.
In MongoDB, the $tan aggregation pipeline operator returns the tangent of a value that is measured in radians.
$tan accepts any valid expression that resolves to a number.
The $tan operator was introduced in MongoDB 4.2.
In MongoDB, the $sinh aggregation pipeline operator returns the hyperbolic sine of a value that is measured in radians.
$sinh accepts any valid expression that resolves to a number.
The $sinh operator was introduced in MongoDB 4.2.
In MongoDB, the $sin aggregation pipeline operator returns the sine of a value that is measured in radians.
$sin accepts any valid expression that resolves to a number.
The $sin operator was introduced in MongoDB 4.2.