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What's the best UML diagramming tool? [closed]

I'm trying to choose a tool for creating UML diagrams of all flavours. Usability is a major criteria for me, but I'd still take more power with a steeper learning curve and be happy. Free (as in beer) would be nice, but I'd be willing to pay if the tool's worth it. What should I be using? ...
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What does curly brackets in the `var { … } = …` statements do?

...-specific JS syntax, but I often found variables being declared this way, for example, in add-on SDK docs : 4 Answers ...
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Html.ActionLink as a button or an image, not a link

...release of ASP.NET MVC, how do I get Html.ActionLink to render as a button or an image instead of a link? 23 Answers ...
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Determine if a String is an Integer in Java [duplicate]

...ing to determine if a particular item in an Array of strings is an integer or not. 9 Answers ...
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Are global variables in PHP considered bad practice? If so, why?

...place_callback('!pattern!', array($obj, 'method'), $str); See callbacks for more. The point is that objects have been bolted onto PHP and in some ways lead to some awkwardness. Don't concern yourself overly with applying standards or constructs from different languages to PHP. Another common pit...
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What does it mean: The serializable class does not declare a static final serialVersionUID field? [d

...ad with technical terms. Is it possible to explain this issue with simple words? 5 Answers ...
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Checking images for similarity with OpenCV

Does OpenCV support the comparison of two images, returning some value (maybe a percentage) that indicates how similar these images are? E.g. 100% would be returned if the same image was passed twice, 0% would be returned if the images were totally different. ...
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What underlies this JavaScript idiom: var self = this?

I saw the following in the source for WebKit HTML 5 SQL Storage Notes Demo : 10 Answers ...
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How to identify server IP address in PHP

... Like this for the server ip: $_SERVER['SERVER_ADDR']; and this for the port $_SERVER['SERVER_PORT']; share | improve this answer ...
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How to set HTTP headers (for cache-control)?

How to enable browser caching for my site? Do I just put cache-control:public somewhere up in my header like this? 8 Answer...