Duplicate elements of array in ruby

Question

I find a lot of reference about removing duplicates in ruby but I cannot find how to create duplicate.

If I have an array like [1,2,3] how can I map it to a

Answer 1

Try this:

[1, 2, 3] * 2

 => [1, 2, 3, 1, 2, 3] 

You might want it sorted:

([1, 2, 3] * 2).sort

 => [1, 1, 2, 2, 3, 3]