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Eloquent JavaScript
book

Eloquent JavaScript

by Marijn Haverbeke
January 2011
Intermediate to advanced content levelIntermediate to advanced
224 pages
5h 43m
English
No Starch Press
Content preview from Eloquent JavaScript

The Environment

The collection of variables and their values that exist at a given time is called the environment. When a program starts up, this environment is not empty. It always contains a number of standard variables. When your browser loads a page, it creates a new environment and attaches these standard values to it. The variables created and modified by programs on that page survive until the browser goes to a new page.

Functions

A lot of the values provided by the standard environment have the type function. A function is a piece of program wrapped in a value. Generally, this piece of program does something useful, which can be evoked using the function value that contains it. In a browser environment, the variable alert, for example, holds ...

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Publisher Resources

ISBN: 9781593272821Errata