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Magic with Groovy & GrailsThe Search is over

Zalán Borsos

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What is Groovy?• Dynamic language• 1.0 released on 02.01.2007• Dynamically compiled to JVM bytecode• 99% of Java code is also valid• Groovy = Java +

dynamic typing +

additional methods & operators +

closures

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If we indent code properly,why do we need semicolons?

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Dynamic TypingJavaArrayList<String> list = new ArrayList<String>() {

{add("A");add("B");add("C");

}};

HashMap<Integer, String> map = new HashMap<Integer, String>() {

{put(1, "A");put(2, "B");put(3, "C");

}};

Groovy

?

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Additional Operators• Spread *.• Elvis ?:• Safe navigation ?.• Equals ==

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Closures“A Groovy Closure is like a ‘code block’ or a method pointer. It is a piece of code that is defined and then executed at a later point.”

http://groovy.codehaus.org/Closures

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Functional Programming• Closures as functions• Closures as function compositions• Fibonacci

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What is Grails?• Web application framework• Convention over consideration• Spring MVC• Fast prototyping and development

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