Expert Spring MVC Given Away at Symantec Seminar

The J2EE Best Practice seminar put on by Symantec is giving attendees a free copy of Expert Spring MVC and Web Flow. That's pretty exciting, but what about a free trip to London for the authors? :)

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Lists and arrays in Dart

(This is Part 3 in a series about Dart. Check out Part 2, Function in Dart.)

Warning: We expect the Dart libraries to undergo potentially sweeping changes before Dart goes to alpha. This document is relevant as of 2011-12-22.

Intro

Dart is a "batteries included" effort to help app developers build modern web apps. An important "battery" is the bundled core Dart libraries, providing common and rich functionality. Dart is building a solution for large, complex web apps, and providing well tested, integrated, and common libraries is key to helping a web app developer be more productive out of the box.

The Collection libraries are a crucial set of APIs that Dart developers get for free. Much more than simple arrays and maps, the Collection library includes standard ways to filter, iterate, inspect, compose, and sort your data. This post specifically looks at List<E>, Dart's ordered, indexable collection of objects.

Aside: The Dart project is lucky to welcome Jos…
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Converting Array to List in Scala

Now, this has to have a built-in somewhere in Scala, because it just seems too common. So, how to convert an Array to a List in Scala?

Why do I need this? I needed to drop to Java for some functionality, which in this case returns an Array. I wanted to get that Array into a List to practice my functional programming skillz.

**Update**: I figured out how to convert Arrays to Lists the Scala way. Turns out it's a piece of cake.

val myList = List.fromArray(Array("one", "two", "three"))

or

val myList = Array("one","two","three").elements.toList

The call to elements returns an Iterator, and from there you can convert to a List via toList. Nice.

Because my first version wasn't actually tail recursive, what follows is a true tail recursive solution, if I were to implement this by hand. The above, built in mechanism is much better, though.


object ArrayUtil {
def toList[a](array: Array[a]): List[a] = {
def convert(ar…
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Maps and hashes in Dart

(This is Part 4 of our ongoing series about Dart. Check out Part 3: Lists and arrays in Dart.)

Warning: We expect the Dart libraries to undergo potentially sweeping changes before Dart goes to alpha. This document is relevant as of 2012-01-02.

Intro

Dart is not just a language, but a full "batteries included" effort to create a productive, familiar, and fun environment for the modern web app developer. The bundled libraries are one such "battery", including many common classes and utilities such as date manipulation, regular expressions, even asynchronous constructs like Future and Promise.

Probably the most used set of libraries will be the Collections, such as List, Map, and Set. In this post, we'll take a look at Map, which is a mapping of keys to values.

In Dart, a Map is an interface designed to manipulate a collection of keys which point to values. Maps can have null values, and can have parameterized types. Note, Maps do not subclass the Collection interfa…
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