what is

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.

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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.

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In MongoDB, the $concat aggregation pipeline operator concatenates two or more strings and returns the concatenated string.

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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.

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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.

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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.

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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.

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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.

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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.

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