How to repeat elements in list n times?

Question

How do I repeat each element of a list n times and form a new list? For example:

x=[1,2,3,4]
n=3

Looking for:

[1,1,1,2,2,2,3,3,3,4,4,4]

Answer 1

An inner argument to repeat is what I was looking for:

repeat([1, 2, 3, 4], inner = 3)