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Function modifiers

cardinality

Commentary​

added in 0.8.3

Restricts the maximum number of unique values that a function can generate. When the limit is exceeded, previously generated values will be chosen at random.

Note that this modifier is a ceiling: if a function can't generate more unique values than the specified cardinality, it won't reach the cardinality limit.

Examples​

Setting cardinality​

Set cardinality to a positive integer. In this example:

  • a is only ever assigned one unique value
  • b is assigned 3 unique values, after which older values are reused
  • c always contains newly generated values
{
    "a": {
        "_gen": "normalDistribution",
        "mean": 10,
        "sd": 2,
        "decimals": 4,
        "cardinality": 1
    },
    "b": {
        "_gen": "normalDistribution",
        "mean": 10,
        "sd": 2,
        "decimals": 4,
        "cardinality": 3
    },
    "c": {
        "_gen": "normalDistribution",
        "mean": 10,
        "sd": 2,
        "decimals": 4
    }
}
[
    {
        "a": 10.6654,
        "b": 11.4568,
        "c": 14.3868
    },
    {
        "a": 10.6654,
        "b": 12.0109,
        "c": 7.8473
    },
    {
        "a": 10.6654,
        "b": 9.2891,
        "c": 9.015
    },
    {
        "a": 10.6654,
        "b": 12.0109,
        "c": 10.9669
    },
    {
        "a": 10.6654,
        "b": 9.2891,
        "c": 11.8215
    },
    {
        "a": 10.6654,
        "b": 12.0109,
        "c": 7.289
    },
    {
        "a": 10.6654,
        "b": 12.0109,
        "c": 10.4089
    },
    {
        "a": 10.6654,
        "b": 9.2891,
        "c": 9.4659
    },
    {
        "a": 10.6654,
        "b": 9.2891,
        "c": 9.9601
    },
    {
        "a": 10.6654,
        "b": 9.2891,
        "c": 10.0386
    }
]

Specification​

JSON schema​

{
    "type": "integer",
    "minimum": 1
}