By Whitney Quesenbery, Sarah Horton

ISBN-10: 1933820977

ISBN-13: 9781933820972

When you are in command of the person event, improvement, or technique for a website, an online for everybody may help you're making your web site available with no sacrificing layout or innovation. Rooted in common layout ideas, this booklet presents suggestions: sensible recommendation and examples of the way to create websites that everybody can use.

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Additional resources for A Web for Everyone: Designing Accessible User Experiences (1st Edition)

Example text

This method of building up and tearing down a single stack is what Node's event loop is ultimately doing. We'll explore the full suite of commands and attributes contained by the process object as we continue to develop examples and libraries in this book. The Read-Eval-Print Loop and executing a Node program Node's REPL (Read-Eval-Print-Loop) represents the Node shell. To enter the shell prompt, enter Node via your terminal without passing a filename: > node You now have access to a running Node process, and may pass JavaScript commands to this process.

Deviation leads to surprises, sometimes very bad surprises, and in general to do so automatically makes an API awkward, a characteristic other developers will rapidly tire of. One is either returning a function result by executing a callback, handling the arguments received by a callback, or designing the signature for a callback within your API. Whichever situation is being considered, one should follow the convention relevant to that case: • The first argument returned to a callback function is any error message, preferably in the form of an error object.

Additionally, on multicore machines, forked processes will be distributed (by the OS) to different cores. Spreading node processes across cores (even other machines) and managing IPC is (one) way to scale a Node application in a stable, understandable, and predictable way. js should fork a child process and send that child a message. The child should respond in kind: Parent said: Child said: I love you I love you too Another very powerful idea is to pass a network server an object to a child. This technique allows multiple processes, including the parent, to share the responsibility for servicing connection requests, spreading load across cores.

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A Web for Everyone: Designing Accessible User Experiences (1st Edition) by Whitney Quesenbery, Sarah Horton


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