Manage JS with asynchronous tasks

Promise objects aim to remove redundant and/or excessive callback functions from background tasks

DOWNLOAD TUTORIAL FILES www.filesilo.co.uk/bks-894 Using callback functions is a sure-fire way to induce JavaScript bloat: we know of some code examples where the accomplishment of a single task requires the presence of a dozen callbacks. Furthermore, callbacks are not a catch-all solution for event handling. As the use of exceptions spreads over to JavaScript, keeping an eye on the various error sources becomes tedious pretty quickly. Even though Promises have not been fully formalised at the time of writing, they nevertheless provide a fascinating alternative to callbacks. In principle, a Promise is but a state machine object whose state reflects the situation of the task at hand. Deploying Promises significantly reduces the efforts involved in callback and event handling. When done right, core functions can be observed at a glance.…

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The Web Design Book (Digital) - 1 Issue, The Web Design Book Vol 6

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