# [Ride v5] Union Functions
⚠️ This is the documentation for the Standard library version 5. We recommend to use version 6. Go to version 6
| 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 |
# value(T|Unit): T
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 |
# valueOrElse(T|Unit, T): T
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 |
# 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.
valueOrErrorMessage(a: T|Unit, msg: String): T
| Parameter | Description |
|---|---|
a: T|Unit | Argument to return value from |
msg: String | Error message |