$pickSet

Takes an array and a number quantity and returns a new n-element array containing unique values from the input array. Optionally picks with probability proportional to a provided weights array.

Options

• from (required) Array of values or operators to choose from.
• quantity (optional) The size of the output array. Default 1.
• weights (optional) Array of weightings (must be the same length as array).

Example

Template

{
    "color": {
        "$pickSet": {
            "from": ["green", "red", "blue"],
            "quantity": 2
        }
    }
}

Output

{
    "color": ["red", "green"]
}