In MongoDB, the $eq aggregation pipeline operator compares two values and returns either true or false, depending on whether the two values are equivalent or not.
Tag: what is
MongoDB $cond
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.
MongoDB $concatArrays
In MongoDB, the $concatArrays aggregation pipeline operator concatenates two or more arrays and returns the concatenated array.
MongoDB $concat
In MongoDB, the $concat aggregation pipeline operator concatenates two or more strings and returns the concatenated string.
MongoDB $cmp
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.
MongoDB $floor
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.
MongoDB $ceil
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.
MongoDB $sqrt
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.
MongoDB $tan
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.
MongoDB $sinh
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.