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[19:29:07] <c4017w> What

[19:30:09] <c4017w> Whats the most efficient way to count the number of a specific element in an array (in aggregation pipleine)? e.g. Count number of false in [true, false, false, false] -> 3

[19:35:24] <c4017w> Right now I'm thinking {$reduce: ..., $in: {%add: ["$$value", {$cond: ["$$this.Result", 0, 1]}]}}

[19:35:35] <c4017w> but that seems pretty horrible

[20:21:49] <c4017w> maybe {$size: {$filter: {..., cond: {$eq: ["$$this.Result", false]}}}} is better?

[20:24:59] <c4017w> Is it possible to $filter and $reduce at the same time? For each item in an array i want to discard it in some cases (filter) and modify it in other cases (reduce)