By Douglas Crockford
So much programming languages include sturdy and undesirable components, yet JavaScript has greater than its proportion of the undesirable, having been constructed and published in a rush sooner than it can be subtle. This authoritative publication scrapes away those undesirable gains to bare a subset of JavaScript that's extra trustworthy, readable, and maintainable than the language as a whole-a subset you should use to create actually extensible and effective code.
Considered the JavaScript professional via many folks within the improvement neighborhood, writer Douglas Crockford identifies the abundance of excellent principles that make JavaScript a good object-oriented programming language-ideas akin to capabilities, unfastened typing, dynamic gadgets, and an expressive item literal notation. regrettably, those stable rules are jumbled together with undesirable and downright lousy principles, like a programming version in accordance with worldwide variables.
When Java applets failed, JavaScript turned the language of the net by way of default, making its acceptance virtually thoroughly self sustaining of its characteristics as a programming language. In JavaScript: the great Parts, Crockford eventually digs during the steaming pile of excellent intentions and errors to provide you an in depth examine the entire surely based elements of JavaScript, including:
• Syntax
• Objects
• Functions
• Inheritance
• Arrays
• usual expressions
• Methods
• Style
• attractive features
The actual good looks? As you progress forward with the subset of JavaScript that this booklet offers, you'll additionally stay clear of the necessity to unlearn the entire undesirable components. in fact, in order to discover extra concerning the undesirable elements and the way to take advantage of them badly, easily seek advice the other JavaScript book.
With JavaScript: the great Parts, you'll find a attractive, dependent, light-weight and hugely expressive language that allows you to create potent code, no matter if you're dealing with item libraries or simply attempting to get Ajax to run quickly. in case you boost websites or functions for the net, this booklet is an absolute needs to.
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Additional info for JavaScript: The Good Parts
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Moreover, if our preferred template engine hasn’t been packaged up to work with Express, it’s trivial to add the functionality ourselves. Since Jade is the default, we’ll use it for this example, but you should choose the template engine that best fits your application’s needs. submit(); }); If you decide to use Jade, note that whitespace in Jade is significant, so things are only nested logically if they’re nested physically. You may also note that there is no doctype or head in the template above.
You may also note that there is no doctype or head in the template above. No matter which template engine it uses, Express expects a layout file containing common page elements—we did the same thing with our parent template earlier. jade in our views directory, we’ve got our view layer wrapped up. The last thing we need to do is to create a controller. render("index"); }); } These controllers for the user object will route the application to the correct view, depending on the request and parameters received, or initiate tasks on the user model.
Creating Files on the Fly An in-depth exploration of any of the necessary modules is out of scope for this guide, but there are numerous libraries to help you generate other types of files from within Node. While these aren’t templates in the same sense as the templates we’ve looked at so far, they can map directly to a filename in a URL and be built and served in a way that’s invisible to the user, just like templates. For instance, you might have cause to dynamically generate image files to do resizing or add watermarks.
JavaScript: The Good Parts by Douglas Crockford
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