This section provides a quick description of JavaScript primitive data types, numbers, strings, and booleans.
JavaScript supports 5 primitive data types:
Numbers - Any types of numeric values including integers and floating point values.
Examples of numbers are: 2008, 3.14, 1.51e10, etc.
Strings - Sequences of Unicode characters. Examples of strings are: "Hello World!", "2008",
"\u4E16\u754C\u4F60\u597D\uFF01", etc.
Booleans - Two values only: true and false.
Null - One value only: null.
Undefined - One value only: undefined.
JavaScript is a dynamic typing language. Data types are associated with values, instead of variables.
In other words, variables are declared without specific data types.
They can be assigned with values of any data type.
In JavaScript source code, values of different data types can be provided as value literals as described
in sections below.
