Operators in Scala (Class -30)

 An Operator is a symbol that represents an operation that is to be performed in the program. 

      Operators tell the compiler to perform a specific operation; each operator is associated with one and has a unique identification code. Operators play an important role in programming and they are used to make an expression that executes to perform a task. 

Scala as a huge range of operators:

a)      a)   Arithmetic operators

b)     Relational operators

c)      Logical operators

d)     Bitwise operators

e)      Assignment operators

Data Types in Scala (Class -29)

 In a programming language, a data type is also known as type, tells the compiler about the type of data that is used by the programmer.

The Scala data types are taken as it is from Java and the storage and length are the same. There are many different types of data types in Scala.

1 Byte = 8 Bits.

Data Types	Values	Storage	Default Value	Usage
Boolean	True / False	2 Bytes	FALSE	Only 2 values.
Integer	minus 2147483648 to 2147483647	4 bytes	0	Commonly used in programming.
Float	IEEE 754 single-precision float.	4 Bytes	0.0F	For the decimal point numbers.
Double	IEEE 754 double-precision float.	8 Bytes	0.0D	To handle decimal point numbers that needs larger value and more precision.
Char	0 to 216-1 Unicode	2 Bytes	\u000'	To handle character assignments stored as unsigned Unicode characters.
String	any length	40 Bytes (Empty String)	Null	Used to store a character sequence in a program.

Scala Identifiers (Class -28)

Identifiers in a programming language are the names given to a class, method, variable or object to identify them in the program.

  e.g.:- myObject, main, args, value1, etc.

Variables in Scala (Class -27)

 A variable is named a reference to a memory location. The location stores the data that is used by the program.

 Collect the data and keep them in a Container. There are 2 types of Collections:

a)      Mutable Collections

b)      Immutable Collections

a)      Mutable Variables are those that allow us to change its value any time in the code.

   e.g.: var keyword

b)      Immutable Variables that are made immutable are read-only variables in Scala. This means their value remains unchanged throughout the program. E.g.: val keyword.

 In both the above cases, you can assign value to a variable with / without datatype.

Keywords in Scala (Class -26)

Keywords are special words for a programming language that have some predefined actions in the programming. Thus, these keywords cannot be used as names for defining objects, classes, functions, variables, etc. The compiler will throw an error if we try to use keywords as identifiers.

Scala programming languages also consist of a set of keywords to help in the efficient working of the program.

There are in total 39 keywords present in Scala. Here is a list of all keywords in Scala,

1. Abstract; 2. Case; 3. Catch; 4. Class; 5. Def; 6. Do; 7. Else; 8. Extends; 9. False; 10. Final; 11. Finally; 12. For; 13. Forsome; 14. If; 15. Implicit; 16. Import; 17. Lazy; 18.  Match;   19. New; 20. Null; 21. Object; 22. Override; 23. Package; 24. Private; 25. Protected;     26. Return; 27. Sealed; 28. Super; 29. This; 30. Throw; 31. Trait; 32. Try; 33. True; 34. Type; 35. Val; 36. Var; 37. While; 38. With; 39. Yield.