Beginning Groovy and Grails: From Novice to Professional by Jim Shingler, Visit Amazon's Joseph Faisal Nusairat Page,

By Jim Shingler, Visit Amazon's Joseph Faisal Nusairat Page, search results, Learn about Author Central, Joseph Faisal Nusairat, , Christopher M Judd

The Rails internet framework has taken the software program via hurricane, delivering legions of net builders the facility to create websites quicker and extra successfully than ever sooner than. yet making the most of Rails potential studying a completely new paradigm, as well as the language Rails is equipped upon: Ruby. therefore, different developer groups have carried out their very own models of Rails, yet equipped utilizing their hottest language. For thousands of Java builders, this local framework is Grails, and the Java-centric scripting language its outfitted upon: Groovy.

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Extra resources for Beginning Groovy and Grails: From Novice to Professional

Example text

AssertionError. Listing 2-11 is an example of the Groovy assertion in Listing 2-10 failing. Listing 2-11. AssertionError: One isn't Two Expression: (1 == 2) As you can see, the error message from Listing 2-10 is embedded in Listing 2-11. Assertions are very handy and one of the cornerstones of good testing. They also do a great job of clarifying intentions. You will see assertions in many of the examples throughout this book. Strings Like most modern languages, Groovy has the concept of a string.

Line 9 illustrates using the each() method to iterate through the array. That deserves a second look. Yes, the each() method is available on the array, which is very convenient. Line 10 also shows something interesting—it uses a range to access the array. In this case, the example goes one step further and shows accessing the array from left to right. 17. org/JN1025-Arrays 18. qxd 32 5/15/08 6:05 PM Page 32 CHAPTER 2 ■ GROOVY BASICS Maps A Groovy map19 is an unordered collection of key/value pairs, where the key is unique, just as in Java.

If you are running a script, Groovy will generate a class with a main method containing the script commands, compile the script, and execute it. If you don’t want to recompile the file each time it is run, you can use the third option. • Compile the file using groovyc into a class and execute it using Java. You saw an example of this approach in the previous section. groovy. groovy to the Groovy runtime. " Groovy Shell The Groovy Shell3 is an interactive command-line application (shell) that allows you to create, run, save, and load Groovy scripts and classes.

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