Reference Types : Introduction « Number Data Type « JavaScript Tutorial

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JavaScript Tutorial » Number Data Type » Introduction

5. 1. 15. Reference Types

Reference types are commonly referred to as classes.

Objects are created by using the new operator and providing the name of the class to instantiate.

For example, the following code creates an instance of the Object class:


var o = new Object();

JavaScript requires parentheses to be used only if there are one or more parameters.

If there are no parameters, the parentheses can be safely omitted:


var o = new Object;

5. 1. Introduction
	5. 1. 1.	Numbers
	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

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