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Groovy Goodness: Swapping Elements in a Collection

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Groovy Goodness: Swapping Elements in a Collection

· Java Zone ·
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Learn how to build stream processing applications in Java-includes reference application. Brought to you in partnership with Hazelcast.

Groovy already has so many extra methods for working with collections. If we have to need to swap two elements in a collection we can use the swap method. We provide the two index values of the elements we want to swap and Groovy swaps the elements.

In the following sample we have a simple list and swap all elements by invoking the swap method two times:

def saying = ['Groovy', 'is', 'great']

def yodaSays = saying.swap(2, 1).swap(0, 1)

assert yodaSays.join(' ') == 'great Groovy is'

Written with Groovy 2.4.1.

Learn how to build distributed stream processing applications in Java that elastically scale to meet demand- includes reference application.  Brought to you in partnership with Hazelcast.

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