How to validate a Map?

[rektplorer64]

Is it possible to:

• validate a specific key;
• iterate over keys;
• iterate over values;
• and iterate over entries?

[nesk]

Yes, this is supported:

val mapValidator = Validator<Map<String, Int>> {
    // Validate a specific key
    this["key7"] { // this: Validatable<Int?>
        isNotNull()
    }

    // Iterate over keys
    keys.each { // this: Validatable<String>
        isGreaterThanOrEqualTo(30)
    }

    // Iterate over values
    values.each { // // this: Validatable<Int>
        isGreaterThanOrEqualTo(30)
    }

    // Iterate over entries
    entries.each {// this: Validatable<Map.Entry<String, Int>>
        constrainIfNotNull { (key, value) -> '2' !in key }
            .otherwise { "Must not have 2 in key" }
    }
}