Working with Lists in Groovy

Groovy comes with native support for Lists.

Creating List

This is the simple way of creating a List in groovy, The above code creates a List of type java.util.ArrayList

You can create an empty List with following code

Adding Elements

1. Using << operator to add elements to a List

You can also add multiple elements in a single line as shown in following code

2. Using +

3. Using +=

Reading Elements

Iterating on List

You can use each or eachWithIndex methods to iterate on a List

1. Using each

2. Using eachWithIndex

Manipulating lists

1. Changing each and every element on a List using collect
   Let say you want to change the case of every element in a List of Strings then you can do the following

Searching on Lists

You can use find & findAll to search on Lists, find returns the first occurrence where as findAll gives a list with all elements which pass the criteria