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MongoDb aggregation if else

Syntax:
{$cond: [<expression>, <true>, <false>] }

Example as given below

db.Customers.aggregate([
    { "$project": {
        "name": 1,
        "customer": {
            "$cond": {
                "if": { "$eq": [ "$Age", 25 ] },
                "then": "YG",
                "else": {
                    "$cond": {
                        "if": { "$eq": ["$Age", 45]},
                        "then: "MYG",
                        "else": "SCZ"
                    }
                }
            }
        }
    }},
   { "$sort": { CreatedDate: 1 }}
]);


For more detail, go to  https://docs.mongodb.com/

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