Whitespace and Semicolons
Any text between the characters /* and */ is treated as a comment. This may span multiple lines.
Arithmetic operators ( +, -, *, / ) are used to compute the value and Assignment operator ( =, +=, %= ) are used to assign the values to variables.
Primitive data type
Non-primitive (reference) data type
primitive data types
String – Number – Boolean – Undefined – Null
non-primitive data types
Array – Object – RegExp