Groovy: Duplicate elements of a list

Groovy provides below ways to duplicate the elements of a list.

a.   Using * operator

b.   Using multiply method

c.    Using Collections.nCopies method

HelloWorld.groovy

numbers = [1, 2, 3]
duplicateNumbers1 = numbers * 3
duplicateNumbers2 = numbers.multiply(3)
duplicateNumbers3 = Collections.nCopies(3, numbers)

println "numbers: $numbers"
println "duplicateNumbers1: $duplicateNumbers1"
println "duplicateNumbers2: $duplicateNumbers2"
println "duplicateNumbers3: $duplicateNumbers3"

Output

numbers: [1, 2, 3]

duplicateNumbers1: [1, 2, 3, 1, 2, 3, 1, 2, 3]

duplicateNumbers2: [1, 2, 3, 1, 2, 3, 1, 2, 3]

duplicateNumbers3: [[1, 2, 3], [1, 2, 3], [1, 2, 3]]

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