Interface Function

Properties

$function: {
    args: ArrayExpression<any>;
    body: CodeExpression;
    lang: "js";
}

Defines a custom aggregation function or expression in JavaScript.

args: ArrayExpression<any>

Arguments passed to the function body. If the body function does not take an argument, you can specify an empty array [ ]
body: CodeExpression

The function definition. You can specify the function definition as either BSON type Code or String.
lang: "js"

The language used in the body. You must specify lang: "js".

4.4