Groovy List

/*
  Collections and maps
*/

//Creating an empty list
def technologies = []

/*** Adding a elements to the list ***/

// As with Java
technologies.add("Grails")

// Left shift adds, and returns the list
technologies << "Groovy"

// Add multiple elements
technologies.addAll(["Gradle","Griffon"])

/*** Removing elements from the list ***/

// As with Java
technologies.remove("Griffon")

// Subtraction works also
technologies = technologies - 'Grails'

/*** Iterating Lists ***/

// Iterate over elements of a list
technologies.each { println "Technology: $it"}
technologies.eachWithIndex { it, i -> println "$i: $it"}

/*** Checking List contents ***/

//Evaluate if a list contains element(s) (boolean)
contained = technologies.contains( 'Groovy' )

// Or
contained = 'Groovy' in technologies

// Check for multiple contents
technologies.containsAll(['Groovy','Grails'])

/*** Sorting Lists ***/

// Sort a list (mutates original list)
technologies.sort()

// To sort without mutating original, you can do:
sortedTechnologies = technologies.sort( false )

/*** Manipulating Lists ***/

//Replace all elements in the list
Collections.replaceAll(technologies, 'Gradle', 'gradle')

//Shuffle a list
Collections.shuffle(technologies, new Random())

//Clear a list
technologies.clear()

[11, 12, 13, 14] – A list of integer values

[‘Angular’, ‘Groovy’, ‘Java’] – A list of Strings

[1, 2, [3, 4], 5] – A nested list

[‘Groovy’, 21, 2.11] – A heterogeneous list of object references

[ ] – An empty list