First Groovy

class Sample {
    def names = ["anna", "annie", "tommy", "bobby", "doggy"];

    public static void main(def args) {
        //Loop
        for (i in 0..5) {
            println "Hello, World!"
        }

        //Closure
        def sample = new Sample();
        //Operation of array
        sample.names << "Terry";
        println sample.names;

        println "-------"
        //lambda expression   each
        sample.names.each({ e -> println(e) });

        println "-------"
        //keyword it.
        sample.names.each { println it }

        println "-------"

        //filter
        List<String> matched = sample.names.findAll { e -> e.contains("o") }
        matched.each { println it }

        println "-------"
        //sort
        sample.names << "William";
        sample.names << "bob";
        List<String> sorted = sample.names.sort({ e -> e.length() })
        sorted.each { println it }

        println "-------"
        //grouped
        Map<Boolean, String> grouped = sample.names.groupBy { e -> e.contains("o") }
        grouped.each { key, value -> println "$key:$value" }
    }
}