By Stoyan Stefanov
ISBN-10: 1449320198
ISBN-13: 9781449320195
Which will considerably extend your net improvement abilities past Hypertext Preprocessor, this sensible, hands-on booklet teaches you ECMAScript—the middle javascript language—from the floor up. You’ll become aware of a few similarities among javascript and personal home page, similar to stipulations and loops, however the basic concentration is on javascript’s special item production, periods, prototypes, and inheritance. javascript wisdom is key for operating with today’s internet, no matter if you’re construction functions for the buyer, the server, or for cellular use—and your personal home page event offers a head begin. This publication might help you turn into fluent with javascript fast, after which function a convenient reference when you begin coding.
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Sample text
A" : "I'm ignored"; // "a" Strict Comparison Have you noticed the triple equals sign === that all code examples used so far? Com‐ parison works similar to PHP: • Three equals signs mean strict comparison (the expressions are compared by both value and type). • Two equals signs mean loose comparison (only values are compared and, if needed, one expression is cast to the type of the other to perform type comparison). In order to make debugging easier, it’s always preferable to know the types you’re com‐ paring, so using === is good practice.
What's sum()'s __scope? I see, a [closure]! // Meh, not in [closure] either, let's keep going. // [closure] is papa()'s __variables object. __scope? // It's the [global __variables]. // I found `global_ten` in [global] scope, yay me! // This was the last chance, otherwise I would // need to throw an error. hundred_more // Not in [local], but found in [closure], all fine. You see now how a chain (the scope chain) is created in the form of a linked list where each function knows its lexical __scope.
Here’s how: 1. Load the file in a WebKit browser. 2. Right-click anywhere and select “Inspect element” to bring up the Web Inspector. 3. Click the Scripts tab. 4. Insert breakpoints by clicking on line numbers 8 and 21. You should see see something like what is shown in Figure 3-1. Scope Chain | 39 Figure 3-1. Breakpoints in the Web Inspector Now refresh the page and you’ll see the code execution stop at line 8. Look at the right‐ hand menu, in the Scope Variables section. You’ll clearly see the chain consisting of Global, Closure, and Local sections, and the variables available inside (Figure 3-2).
javascript for PHP Developers by Stoyan Stefanov
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