O'Reilly Media, Inc. Closure: The Definitive Guide, the image of a golden plover, and related trade dress are trademarks of O'Reilly Media, Inc. Many of the. If you're ready to use Closure to build rich web applications with JavaScript, this hands-on guide has precisely what you need to learn this suite of tools in depth. [Free] Closure The Definitive Guide By Bolin Michael Oreilly Media Paperback Paperback. [PDF] [EPUB] explanation about Ebook Pdf.

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Contribute to sanigo/books development by creating an account on GitHub. Closure The Definitive Guide Closure The Definitive Gd Paperback. Ebook Closure Description: An. Online Source Download and Free Ebook PDF Manual Reference Free Download Books Closure-the-definitive-guide-author-michael-bolin-oct

Examples Let's begin looking at an implementation of the Module pattern by creating a module which is self-contained. The counter variable is actually fully shielded from our global scope so it acts just like a private variable would - its existence is limited to within the module's closure so that the only code able to access its scope are our two functions. Our methods are effectively namespaced so in the test section of our code, we need to prefix any calls with the name of the module e.

When working with the Module pattern, we may find it useful to define a simple template that we use for getting started with it.

The module itself is completely self-contained in a global variable called basketModule. The basket array in the module is kept private and so other parts of our application are unable to directly read it. It only exists with the module's closure and so the only methods able to access it are those with access to its scope i.

Notice how the scoping function in the above basket module is wrapped around all of our functions, which we then call and immediately store the return value of. This has a number of advantages including: The freedom to have private functions and private members which can only be consumed by our module. As they aren't exposed to the rest of the page only our exported API is , they're considered truly private. Given that functions are declared normally and are named, it can be easier to show call stacks in a debugger when we're attempting to discover what function s threw an exception.

J Crowder has pointed out in the past, it also enables us to return different functions depending on the environment. In the past, I've seen developers use this to perform UA testing in order to provide a code-path in their module specific to IE, but we can easily opt for feature detection these days to achieve a similar goal.

Module Pattern Variations Import mixins This variation of the pattern demonstrates how globals e. This effectively allows us to import them and locally alias them as we wish. This takes as its first argument a dot-separated string such as myObj. Using setObject allows us to set the value of children, creating any of the intermediate objects in the rest of the path passed if they don't already exist.

For example, if we wanted to declare basket. Here, we see an example of how to define a namespace which can then be populated with a module containing both a private and public API. The following example is heavily based on the original YUI Module pattern implementation by Eric Miraglia, but again, isn't vastly different from the vanilla JavaScript version: Y. Ben Cherry previously suggested an implementation where a function wrapper is used around module definitions in the event of there being a number of commonalities between modules.

In the following example, a library function is defined which declares a new library and automatically binds up the init function to document.


For starters, it's a lot cleaner for developers coming from an object-oriented background than the idea of true encapsulation, at least from a JavaScript perspective.

Secondly, it supports private data - so, in the Module pattern, public parts of our code are able to touch the private parts, however the outside world is unable to touch the class's private parts no laughing! Oh, and thanks to David Engfer for the joke. Disadvantages The disadvantages of the Module pattern are that as we access both public and private members differently, when we wish to change visibility, we actually have to make changes to each place the member was used.

We also can't access private members in methods that are added to the object at a later point. That said, in many cases the Module pattern is still quite useful and when used correctly, certainly has the potential to improve the structure of our application. Other disadvantages include the inability to create automated unit tests for private members and additional complexity when bugs require hot fixes.

It's simply not possible to patch privates.

Instead, one must override all public methods which interact with the buggy privates. Developers can't easily extend privates either, so it's worth remembering privates are not as flexible as they may initially appear.

For further reading on the Module pattern, see Ben Cherry's excellent in-depth article on it. The Revealing Module pattern came about as Heilmann was frustrated with the fact that he had to repeat the name of the main object when we wanted to call one public method from another or access public variables.

The result of his efforts was an updated pattern where we would simply define all of our functions and variables in the private scope and return an anonymous object with pointers to the private functionality we wished to reveal as public.

It also makes it more clear at the end of the module which of our functions and variables may be accessed publicly which eases readability. Disadvantages A disadvantage of this pattern is that if a private function refers to a public function, that public function can't be overridden if a patch is necessary.

This is because the private function will continue to refer to the private implementation and the pattern doesn't apply to public members, only to functions. SLAs can be assigned to incidents based on their parameters like category, requester, impact, urgency etc.

Post-incident review After an incident has been closed, it's good practice to document all the takeaways from that incident. This helps better prepare teams for future incidents and creates a more efficient incident management process. Internal evaluation Who detected the incident and how?

How soon was the incident detected after it occurred? Could the incident have been identified earlier? Could any tools or technologies have aided in the prompt or pre-emptive detection of the incident?

Information flow and communication: How quickly were the stakeholders informed about the incident? What channel was used for relaying notifications? Were all the relevant stakeholders promptly updated with the latest information?

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How easy was it to communicate with the end user s to gather information and keep them informed on the status of the ticket? Structure How was the incident response team initially structured?

Was this structure adhered to throughout the incident management life cycle? If not, why? Can the incident handling team be organized in a better way?

If so, how? Resource utilization What resources were employed to handle the incident? Were those resources used to their optimal capacity? How quickly were resources mobilized to handle the incident? Could resource utilization be improved in the future?

Process How closely was the defined incident management process followed? Were there any deviations in the incident management workflow and process?

Were the incident SLAs honored? If not, which SLAs were breached? Was there adequate monitoring of the process being followed for handling the incident?

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Could the process be improved to make it more efficient? Using too many application components can potentially make your code harder to test and maintain. In many cases, you can simply create a local component and use it when needed.

If it is not accessed at all during a request, it will not be instantiated. Sometimes, however, you may want to instantiate an application component for every request, even if it is not explicitly accessed. To do so, you may list its ID in the bootstrap property of the application.

You can also use Closures to bootstrap customized components. Returning an instantiated component is not required. For example, the request component is used to collect information about a user request and resolve it into a route ; the db component represents a database connection through which you can perform database queries.

Table of contents

It is with help of these core application components that Yii applications are able to handle user requests. Below is the list of the predefined core application components. You may configure and customize them like you do with normal application components.If the type inadvertently fails to satisfy the interface, the JSON encoder will still work, but will not use the custom implementation.

When a program is under active development, however, unused imports and variables often arise and it can be annoying to delete them just to have the compilation proceed, only to have them be needed again later. One consequence of the semicolon insertion rules is that you cannot put the opening brace of a control structure if, for, switch, or select on the next line.

Since the memory returned by new is zeroed, it's helpful to arrange when designing your data structures that the zero value of each type can be used without further initialization. Println x prints [1 2 3 4 5 6]. It's easy to write a function to print the arguments.

It unifies for and while and there is no do-while. ReadWriter is invoked, it has exactly the same effect as the forwarding method written out above; the receiver is the reader field of the ReadWriter, not the ReadWriter itself. Open name This statement declares two variables, f and err.