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Chapter 6. Script Content > Script Language Specification Overview

6.3. Script Language Specification Overview

ECMA Script is an object-oriented programming language for performing computations and manipulating computational objects within a host environment. ECMA Script is not intended to be computationally self-sufficient; indeed, there are no standard provisions in ECMA Script for input of external data or output of computed results. Instead, it is expected that the computational environment of an ECMA Script program provides not only the objects and other facilities, but also certain environment-specific host objects, whose description and behavior are implementation dependent.

A scripting language is a programming language that is used to manipulate, customize, and automate the facilities of an existing system. In such systems, useful functionality is already available through a user interface, and the scripting language is a mechanism for exposing that functionality to program control. In this way, the existing system is said to provide a host environment of objects and facilities, which completes the capabilities of the scripting language. A scripting language is intended for use by both professional and nonprofessional programmers. To accommodate nonprofessional programmers, some aspects of the language may be somewhat less strict.


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