An expression that resolves to an array.
A name for the variable that represents each individual element of the input array. If no name is specified, the variable name defaults to this.
An expression that is applied to each element of the input array. The expression references each element individually with the variable name specified in as.
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Applies a subexpression to each element of an array and returns the array of resulting values in order. Accepts named parameters.
https://docs.mongodb.com/manual/reference/operator/aggregation/map/#mongodb-expression-exp.-map