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This note is an overview and summary of the “ECMA-262-3 in detail” series. Every section contains references to the appropriate matching chapters so you can read them to get a deeper understanding.
Intended audience: experienced programmers, professionals.
We start out by considering the concept of an object, which is fundamental to ECMAScript.
An object
ECMAScript, being a highly-abstracted object-oriented language, deals with objects. There are alsoprimitives, but they, when needed, are also converted to objects.
An object is a collection of properties and has a single prototype object. The prototype may be either an object or the null value.
Let’s take a basic example of an object. A prototype of an object is referenced by the internal[[Prototype]] property. However, in figures we will use __<internal-property>__ underscore notation instead of the double brackets, particularly for the prototype object: __proto__ (which is a real, but non-standard, feature in some engines, e.g. SpiderMonkey).
For the code:
var foo = {
x: 10,
y: 20
};