Groovy as a scripting language

Groovy as a scripting language

• 1.
  GROOVY AS ASCRIPTING LANGUAGECreatedby /JennStrater @jennstrater
• 2.
  WHAT'S GROOVY? Groovyis adynamiccompiled language for the JavaVirtual Machine (JVM)
• 4.
  HELLO WORLD IN JAVA: publicclassMain { publicstaticvoidmain(String[]arguments){ System.out.println("HelloWorld!"); } } INGROOVY: println"Hello,World!"
• 5.
  DATA TYPES Strings Functions Collections Lists Maps
• 6.
  STRINGS Single Quotes 'Hello,world!' Double Quotes--GString "Hello,$name" Multi-line Strings '''This is a multi-line string'''
• 7.
  STRING MANIPULATION Split defmyString='I<3Groovy' myString.tokenize('<3') -->[I,Groovy] Join defmyListOfStrings=['I','<3','Groovy'] myListOfStrings.join('') -->I<3Groovy
• 8.
  CLOSURES defa={params->println(params*2)} [1,2,3].eacha -->2 -->4 -->6 a(1) -->2
• 9.
  COLLECTIONS
• 10.
  Lists defmyList=['a','b',2] myList.multiply(2) -->['a','b','2','a','b','2']
• 11.
  SPECIAL FUNCTIONS Spread Dot myList*.multiply(2) -->['aa','bb',4]
• 12.
  MAPS defmyMap=[val1:'a',val2:'b',val3:'b'] myMap.values() -->['a','b',2] myMap.find{it.value=='b'} -->val2=b myMap.findAll{it.value=='b'} -->[val2:b,val3:b]
• 13.
  LOOPS
• 14.
  Each defmyList=[1,2,3] defresult=[] myList.each{ result<<it*2 } printlnresult -->[2,4,6]
• 15.
  Collect defmyList=[1,2,3] defresult=myList.collect{item-> item.multiply(2) } printlnresult -->[2,4,6]
• 16.
  Ranges (1..3).each{ printlnit*2 } -->2 -->4 -->6
• 17.
  FILE PROCESING
• 18.
  CREATING & WRITINGTO FILES defmyFile=newFile('foo.txt') myFile.write'hello,world!!n' myFile.append('andhellouniverse!')
• 19.
  READING FILES defmyFile=newFile('foo.txt') myFile.eachLine{line-> defprocessedLine=line.replaceAll('hello','hi') printlnprocessedLine } -->hi,world! -->andhiuniverse!
• 20.
  THINGS TO REMEMBER Typingvariablesis optional Some syntax is optional semi-colons parenthesis around function parameters explicitreturn statements The lastoperation completed is the defaultreturn value There is more than one wayto do almosteverything!
• 21.
  EXERCISES (HANDOUT) RESOURCES http://beta.groovy-lang.org/docs/groovy- 2.3.1/html/documentation/#_introduction http://beta.groovy-lang.org/docs/latest/html/groovy-jdk/