# Union Functions

Name	Description	Complexity
isDefined(T\|Unit): Boolean	Checks if an argument is not `unit`	1
value(T\|Unit): T	Gets a value from a `union` type argument. Fails if it is `unit`	2
valueOrElse(T\|Unit, T): T	Returns a value from a `union` type argument if it's not `unit`. Otherwise, returns the second argument	2
valueOrErrorMessage(T\|Unit, String): T	Gets a value from a `union` type argument if it's not `unit`. Otherwise, fails with the message specified in the second argument	2

# isDefined(T|Unit): Boolean

Checks if an argument is not unit.

isDefined(a: T|Unit): Boolean

Parameter	Description
`a`: T\|Unit	Argument to check

Gets a value from a union type argument. Fails if it is unit.

value(a: T|Unit): T

Parameter	Description
`a`: T\|Unit	Argument to return value from

Returns a value from a union type argument if it's not unit. Otherwise, returns the second argument.

valueOrElse(t: T|Unit, t0: T): T

Parameter	Description
`t`: T\|Unit	Argument to return value from
`t0`: T	Returned if `t` is `unit`

Gets a value from a union type argument if it's not unit. Otherwise, fails with the message specified in the second argument.

valueOrErrorMessage(a: T|Unit, msg: String): T

Parameter	Description
`a`: T\|Unit	Argument to return value from
`msg`: String	Error message