I need to create array with repeating elements (not single value)

Using Swift
2

You could leverage flatMap on Array:

Array(repeating: [1,2,3], count: 10).flatMap { $0 }

gives you [1, 2, 3, 1, 2, 3, 1, 2, 3, 1, 2, 3, 1, 2, 3, 1, 2, 3, 1, 2, 3, 1, 2, 3, 1, 2, 3, 1, 2, 3].

The documentation for Array.flatMap actually has pretty good documentation of what flatMap does with Arrays (concatenation).

As the docs point out, you can also use

Array(Array(repeating: [1,2,3], count: 10).joined())

which is probably a better and more readable way of achieving what you're looking for.

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