Dart for Hipsters by Chris Strom

By Chris Strom

In Dart for Hipsters, you stick to project-based chapters demonstrating real-world difficulties solved with Dart. each one undertaking serves because the origin for deeper dialogue of defining good points of Dart, akin to its aid for sensible programming. As you strengthen your figuring out of Dart, you are going to stream directly to extra complicated tasks which, in flip, spur extra advanced discussions, comparable to how one can hold Dart and JavaScript side-by-side. through the tip of this ebook, not just will you could have an intensive advent to the language, yet you are going to even have equipped a whole MVC library from scratch.

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We begin with the old standby, the Fibonacci sequence. In JavaScript, this might be written like so: function fib(i) { if (i < 2) return i; return fib(i-2) + fib(i-1); } The Fibonacci sequence is a wonderful example for exploring the functional programming nature of a language since it, er, is a function but also because it demonstrates how to invoke a function because of its recursive nature. 1 Instead, let’s focus on how to use the function in JavaScript. fib(1) // => 1 fib(3) // => 3 fib(10) // => 55 So, JavaScript functions are simple enough.

Document. query('#content'). query('#gallery'). remove(); The previous would find the element with the ID of "content"; then, inside that, it would find the "gallery" element and remove it from the page.

2.

Not being required to walk up to an element’s parent to remove the element, as we have to do in JavaScript, is a nice win. 5 Updating Elements We have already discussed adding and removing elements from a parent element. Aside from those actions, the most common manipulation is adding and removing CSS classes on an element.

Aside from that, the two function definitions are identical, as is invoking the two. fib(1); // => 1 fib(5); // => 5 fib(10); // => 55 If nothing else, we can see that the designers of the Dart language have certainly succeeded in producing something familiar. 1 Anonymous Functions The experienced JavaScript programmer is well-versed in using anonymous functions. Since functions in JavaScript are a first-order concept, functions are passed around in JavaScript with abandon. Some even lament the callback hell of certain frameworks, but aesthetics aside, there can be no denying that anonymous functions are an important thing in JavaScript.

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