In MongoDB, the $gt aggregation pipeline operator compares two values and returns either true or false, depending on whether or not the first value is greater than the second value.
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MongoDB $lte Aggregation Pipeline Operator
In MongoDB, the $lte aggregation pipeline operator compares two values and returns either true or false, depending on whether or not the first value is less than or equal to the second value.
MongoDB $lt Aggregation Pipeline Operator
In MongoDB, the $lt aggregation pipeline operator compares two values and returns either true or false, depending on whether or not the first value is less than the second value.
MongoDB $filter
In MongoDB, the $filter aggregation pipeline operator returns a subset of an array based on a specified condition.
The $filter operator returns an array with only those elements that match the condition, in their original order.
MongoDB $exp
In MongoDB, the $exp aggregation pipeline operator raises Euler’s number (i.e. e ) to the specified exponent and returns the result.
The exponent can be any valid expression that resolves to a number.
Continue readingMongoDB $tanh
In MongoDB, the $tanh aggregation pipeline operator returns the hyperbolic tangent of a value that is measured in radians.
$tanh accepts any valid expression that resolves to a number.
The $tanh operator was introduced in MongoDB 4.2.
MongoDB $eq Aggregation Pipeline Operator
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.
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.