This is a synonym for required
Does this Args contain a given key?
Equivalent to .
Equivalent to .optional(key).getOrElse(default)
Get the list of values associated with a given key.
Get the list of values associated with a given key. if the key is absent, return the empty list. NOTE: empty does not mean the key is absent, it could be a key without a value. Use boolean() to check existence.
If there is zero or one element, return it as an Option.
If there is zero or one element, return it as an Option. If there is a list of more than one item, you get an error
Gets the list of positional arguments
return exactly one value for a given key.
return exactly one value for a given key. If there is more than one value, you get an exception