Table of Contents
What are the subclasses of any in Scala?
Any has two direct subclasses: AnyVal and AnyRef. AnyVal represents value types. There are nine predefined value types and they are non-nullable: Double, Float, Long, Int, Short, Byte, Char, Unit, and Boolean. Unit is a value type which carries no meaningful information.
When to use option type in Scala program?
For instance, the get method of Scala’s Map produces Some(value) if a value corresponding to a given key has been found, or None if the given key is not defined in the Map. Option type is used frequently in Scala programs and you can compare this with the null value available in Java which indicate no value.
Are there any non nullable value types in Scala?
Scala Type Hierarchy. AnyVal represents value types. There are nine predefined value types and they are non-nullable: Double, Float, Long, Int, Short, Byte, Char, Unit, and Boolean. Unit is a value type which carries no meaningful information. There is exactly one instance of Unit which can be declared literally like so: ().
What are the nine types of AnyVal in Scala?
AnyVal represents value types. There are nine predefined value types and they are non-nullable: Double, Float, Long, Int, Short, Byte, Char, Unit, and Boolean. Unit is a value type which carries no meaningful information. There is exactly one instance of Unit which can be declared literally like so: ().
What are the values of Scala data types?
Range -32768 to 32767 32 bit signed value. Range -2147483648 to 2147483647 16 bit unsigned Unicode character. Range from U+0000 to U+FFFF
Which is a product of two elements in Scala?
Product2 is a trait in Scala, which is a Cartesian product of two elements. In build-in classes it can be considered as tuple of two elements. The Linear Supertypes here are Product, Equals, Any, and the sub-class here is Tulple2. Product2 extends Product like below: Here, T1 and T2 are the types of the elements.
When is a value class instantiated in Scala?
A value class is actually instantiated when: a value class is treated as another type. a value class is assigned to an array. doing runtime type tests, such as pattern matching.
For instance, the get method of Scala’s Map produces Some(value) if a value corresponding to a given key has been found, or None if the given key is not defined in the Map. Option type is used frequently in Scala programs and you can compare this with the null value available in Java which indicate no value.