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Ranges are Lists ( java.util.List ) with sequential values. There are two ways you can define Ranges, using .. this includes the ending value and other way is using ..< which does not include the ending value. Lets see some examples using a Groovy Program


class RangesInGroovy {

    static main(args) {

        def rating = 1..5
        println rating // prints [1, 2, 3, 4, 5]
        println rating.from // prints 1
        println rating.to // prints 5

        def scale = 1..<10
        println scale // prints [1, 2, 3, 4, 5, 6, 7, 8, 9]
        println scale.from // prints 1
        println scale.to // prints 9

    }
}

Ranges are handy to use in for loops

for (i in 1..5) {
    println i
}

(1..5).each {
  println it
}

Another beautiful thing about Ranges is, they can be used in Switch statement, take a look at following program, where the cases are actually ranges which gives the program more readability


class AgeRanges {

    static main(args) {

        def input = 15

        switch(input) {
            case 0..2 : println 'Infant'; break;
            case 3..12 : println 'Child'; break;
            case 13..59 : println 'Adult'; break;
            case 59..100 : println 'Senior Citizen'; break;

            default : println 'NA'
        }

    }
}



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