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Node.js Meets .NET – Edge.js

With so much JavaScript development on the client side, it only makes sense that developers and organizations would want to develop server side applications using JavaScript as well.  Node.js has become a popular choice for building server side applications using JavaScript because of its asynchronous event-driven model and many libraries and extensions that are available. But sometimes JavaScript is not ...

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AngularJS Tip: Using a Filter with ngClass

I was working on my presentation of building an AngularJS app for the upcoming Atlanta Code Camp and ran into an interesting scenario. The app tracks various variables and formulas and then displays them in a responsive fashion. I’ll post the deck and code after the camp. One formula is Body Mass Index, an indication of general weight and health. ...

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Simple JavaScript OOP for C++, Java and C# Developers

Introduction Most developers are familiar with object-oriented programming and design in languages like Java, C++ and C#. JavaScript, however, does not provide any obvious means to support this kind of object-oriented development. The result is that structured code becomes very hard to write for developers new to the world of JavaScript. If you have written a few programs in JavaScript ...

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jQuery Tooltip Example

Tooltips are a very useful element in web development, as it makes it easy to present information and explanations to the user without cluttering the page. Essentially, a tooltip is a “hover box” that appears when we hover the mouse cursor over a specific element. That way, the information will be presented in real-time, only when the user actually needs ...

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Playing with concurrency and performance in Java and Node.js

Imagine a simple market where buyers and sellers interested in the same product come together to trade. For each product in the market, buyers interested in the product could form an orderly queue, sorted on a “first come, first serve” basis. Each buyer could then approach the cheapest seller and trade, purchasing as much of the product from the seller ...

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Batten Down Those Node Dependency Hatches

Dependency management is oftentimes a mundane subject. And it’s not much of a subject at all if you don’t depend on rapidly changing libraries. Of course, you might not always realize you’re depending on a rapidly changing library – especially, if you happen to take a rather liberal approach of depending on snapshots or latest versions, as I often do. ...

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How the JavaScript heatmap implementation works?

A heatmap is a powerful way to visualise data. Given a matrix of data each value is represented by a color. The implementation of the heatmap algorithm is expensive in computation terms: for each grid’s pixel you need to compute its colour from a set of known values. As you can thing, it is not feasible to be implement it on the ...

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Testing Network Errors With MongoDB

Someone asked on Twitter today for a way to trigger a connection failure between MongoDB and the client. This would be terribly useful when you’re testing your application’s handling of network hiccups. You have options: you could use mongobridge to proxy between the client and the server, and at just the right moment, kill mongobridge. Or you could use packet-filtering ...

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JavaScript String Split Example

When building or maintaining an interactive website, it may happen that the input you get from the user can be correct in meaning, but written as a long string separated by special characters such as commas or semicolons. In these cases, JavaScript string split functions come to the rescue. You can split the long string into small ones and save ...

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