Note 1. ECMAScript. Bound functions.

As we know, ECMA-262-5 standardized bind method of the Function.prototype. The source of the current version of this method is “Prototype.js” library, although, the standardized version has several differences. This approach is well known and was successfully used in ES3, so the main purpose of the current note is to show the technical details and differences (which can cause confusing) of the ES5 implementation. Continue reading

ECMA-262-5 in detail. Chapter 1. Properties and Property Descriptors.

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Introduction

This chapter is devoted generally to one of new concepts of the ECMA-262-5 specification — to property attributes and mechanism of their handling — property descriptors.

Usually saying that “an object has some property” we mean an association between a property name and its value. But as we know from the ES3 analysis, a property structure is more complex than just a string name. It also has set of attributes — those which we already discussed in ES3, e.g. {ReadOnly}, {DontEnum} and other. So from this viewpoint a property is as an object itself. Continue reading

Тонкости ECMA-262-5. Часть 1. Свойства и дескрипторы свойств

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Введение

Эта глава посвященна одной из новых концепций в спецификации ECMA-262-5 — атрибутам свойств и механизму работы с ними, дескрипторам свойств.

Обычно, говоря, что объект имеет какие-то свойства, мы имеем ввиду связь между именем свойства и его значением. Но, как мы знаем из анализа ES3, структура свойства несколько сложнее, чем просто строковое имя. Оно также имеет набор атрибутов — те, которые мы уже обсудили в статьях об ES3, например {ReadOnly}, {DontEnum} и другие. С этой точки зрения свойство само по себе является объектом. Continue reading

ECMA-262-3 in detail. Chapter 7.2. OOP: ECMAScript implementation.

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Introduction

This is the second part of article about object-oriented programming in ECMAScript. In the first part we discussed the general theory and drew parallels with ECMAScript. Before reading of the current part, if it is necessary, I recommend reading the first part as in this article we will actively use the passed terminology. You can find the first part here: ECMA-262-3 in detail. Chapter 7.1. OOP: The general theory.
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