Introduction « Number Data Type « JavaScript Tutorial

5.1.2.Number() Object
5.1.3.Variables are loosely typed.
5.1.4.Built-in Values
5.1.5.Special Numerical Values
5.1.6.Primitive and Reference Values
5.1.7.Primitive Types
5.1.8.The Undefined Type
5.1.9.The Null Type

5.1.10.The Boolean Type
5.1.11.The Number Type
5.1.12.Number.MAX_VALUE and Number.MIN_VALUE define the outer bounds of the Number value set
5.1.13.NaN stands for Not a Number
5.1.14.JavaScript primitive values, Booleans, numbers, and strings, are pseudo-objects
5.1.15.Reference Types