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POHow do JavaScript closures work?
 

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    1. COMy problem with these and many answers is that they approach it from an abstract, theoretical perspective, rather than starting with explaining simply why closures are necessary in Javascript and the practical situations in which you use them. You end up with a tl;dr article that you have to slog through, all the time thinking, "but, why?". I would simply start with: closures are a neat way of dealing with the following two realities of JavaScript: a. scope is at the function level, not the block level and, b. much of what you do in practice in JavaScript is asynchronous/event driven.
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      1. USJeremy Burton
    2. CO@Redsandro For one, it makes event-driven code a lot easier to write. I might fire a function when the page loads to determine specifics about the HTML or available features. I can define and set a handler in that function and have all that context info available every time the handler is called without having to re-query it. Solve the problem once, re-use on every page where that handler is needed with reduced overhead on handler re-invocation. You ever see the same data get re-mapped twice in a language that doesn't have them? Closures make it a lot easier to avoid that sort of thing.
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      1. USErik Reppen
    3. CO__@Erik Reppen__ thanks for the answer. Actually, I was curious about the benefits of this hard to read `closure` code as opposed to `Object Literal` which reuses itself and reduces overhead just the same, yet requires 100% less wrapping code.
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