JavaScript : Object-Oriented Programming

Primitive data types recap

Let's quickly summarize some of the main points discussed so far:

• There are five primitive data types in JavaScript:
  • Number
  • String
  • Boolean
  • Undefined
  • Null
• Everything that is not a primitive data type is an object
• The primitive number data type can store positive and negative integers or floats, hexadecimal numbers, octal numbers, exponents, and the special numbers NaN, Infinity, and –Infinity
• The string data type contains characters in quotes
• The only values of the Boolean data type are true and false
• The only value of the null data type is the value null
• The only value of the undefined data type is the value undefined
• All values become true when converted to a Boolean, with the exception of the six falsy values:
  • ""
  • null
  • undefined
  • 0