By Adam L. Davis
Start development robust apps that make the most of the dynamic scripting functions of the Groovy language. This booklet covers Groovy basics, resembling fitting Groovy, utilizing Groovy instruments, and dealing with the Groovy improvement equipment (GDK). you are going to additionally study extra complex facets of Groovy, similar to utilizing Groovy layout styles, writing DSLs in Groovy, and making the most of Groovy's sensible programming features.
There is extra to Groovy than the center language, so Learning Groovy covers the prolonged Groovy atmosphere. you will see tips to harness Gradle (Groovy's construct system), Grails (Groovy's internet program framework), Spock (Groovy's checking out framework), and Ratpack (Groovy's reactive internet library).
What you will learn
- Groovy basics, together with the GDK or Groovy improvement Kit
- Advanced Groovy, comparable to writing Groovy DSLs
- Functional programming in Groovy
- GPars, the integrated concurrency library
- Gradle, the construct system
- Grails, the net program framework
- Spock, the trying out framework
- Ratpack, the reactive net library
Who is that this booklet for
Although this booklet is meant for people with a Java historical past, someone with uncomplicated programming abilities may gain advantage from it. This publication is a data-filled, but easy-to-digest travel of the Groovy language and atmosphere.
Read Online or Download Learning Groovy PDF
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Extra resources for Learning Groovy
Example text
Each—Iterates through the values using the given closure. • eachWithIndex—Iterates through with two parameters: a value and an index. • find – Finds the first element that matches a closure. • findIndexOf—Finds the first element that matches a closure and returns its index. • any—True if any element returns true for the closure. • every—True if all elements return true for the closure. • reverse—Reverses the ordering of elements in a list. • first—Gets the first element of a list. • last—Returns the last element of a list.
141592d Exercise Try multiplying different number types and determining the class of the result. Boolean-Resolution Since Groovy is very similar to Java, but not Java, it's easy to get confused by the differences. A couple of the areas of confusion are boolean-resolution (also called “Groovy truth”) and the Map syntax sugar. 26 CHAPTER 5 ■ COMING FROM JAVA Groovy is much more liberal in what it accepts in a Boolean expression. For example, an empty string and a zero are considered false. "") println("true") (42) println("true") (!
It can be used dynamically or statically-typed; it’s your choice. It supports functional programming constructs, including first-class functions, currying, and more. It has multiple-inheritance, type inference, and meta-programming. CHAPTER 6 Groovy Design Patterns Design patterns are a great way to make your code functional, readable, and extensible. There are some patterns that are easier and require less code in Groovy compared to Java. Strategy Pattern Imagine you have three different methods for finding totals: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 def totalPricesLessThan10(prices) { int total = 0 for (int price : prices) if (price < 10) total += price total } def totalPricesMoreThan10(prices) { int total = 0 for (int price : prices) if (price > 10) total += price total } def totalPrices(prices) { int total = 0 for (int price : prices) total += price total } A lot of code is duplicated in this case.