You can use Bag with { } to create a set you may use to loop over.

A Bag can contain duplicates, so it's just a collection of something.

With Integers:

Bag{14,22,12,53,2,11,66}->collect(i| DoSomthingWithAnInt(i)) 

With Strings:

Bag{'String', 'EmailAddress'}->collect(s| DoSomthingWithAString(s)) 

If you want to create a sequence of numbers (in order), you can use the Sequence operator.

Other names for a set: collection of strings, array of numbers, static array, initialize array, list of numbers

See also: Set