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Download e-book for iPad: Learning Groovy by Adam L. Davis

By Adam L. Davis

ISBN-10: 1484221168

ISBN-13: 9781484221167

ISBN-10: 1484221176

ISBN-13: 9781484221174

Start development robust apps that make the most of the dynamic scripting functions of the Groovy language. This booklet covers Groovy basics, corresponding to fitting Groovy, utilizing Groovy instruments, and dealing with the Groovy improvement equipment (GDK). you are going to additionally research extra complicated points of Groovy, corresponding to utilizing Groovy layout styles, writing DSLs in Groovy, and benefiting from Groovy's useful programming features.

There is extra to Groovy than the center language, so Learning Groovy covers the prolonged Groovy surroundings. you will see tips on how to harness Gradle (Groovy's construct system), Grails (Groovy's net software framework), Spock (Groovy's trying out framework), and Ratpack (Groovy's reactive net library).

What you are going to learn

  • Groovy basics, together with the GDK or Groovy improvement Kit
  • Advanced Groovy, equivalent to writing Groovy DSLs
  • Functional programming in Groovy
  • GPars, the integrated concurrency library
  • Gradle, the construct system
  • Grails, the net software framework
  • Spock, the checking out framework
  • Ratpack, the reactive net library

Who is that this booklet for
Although this publication is meant for people with a Java history, an individual with easy programming abilities may gain advantage from it. This e-book is a data-filled, but easy-to-digest travel of the Groovy language and atmosphere.

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Extra info for Learning Groovy

Sample text

AnnotationCollector can be used to create a meta-annotation • Many improvements to existing AST transformations This release saw a huge improvement in performance by taking advantage of Java 7’s invoke dynamic. However, it is not enabled by default (this will be covered in a later chapter; basically you just have to “turn it on”). org/latest/html/documentation/core-metaprogramming. html#_extension_modules 13 CHAPTER 2 ■ GROOVY 101 The main point to notice here is implicit closure coercion, which allows you to use closures anywhere a SAM (single abstract method interface) could be used.

Properties files, ConfigSlurper allows for a dot notation. It also allows for nested (closure) configuration values and arbitrary object types. name" == 'Test42' Expando The Expando class can be used to create a dynamically expandable object. You can add fields and methods. This can be useful when you want to use extremely dynamic meta-programming. say('hello') // Draco says: hello 21 CHAPTER 4 ■ GDK ■ Exercise Use meta-programming to alter some class’s metaClass and then print out the class of the metaClass.

0 and above. © Adam L. Davis 2016 A. L. 1007/978-1-4842-2117-4_3 15 CHAPTER 3 ■ TOOLS Invoke-dynamic helps the compiler improve the performance of things like ducktyping, meta-programming, and method-missing calls. Shell 1 groovysh The Groovy shell can be used to execute Groovy code in an interactive command shell. ■ Exercise Try it out! Documentation 1 groovydoc This tool generates documentation from your Groovy code. Groovy uses the same comment syntax as Java, including the conventions for documenting code.

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Learning Groovy by Adam L. Davis

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