If your array contains <code>Int</code> as well as <code>[Int]</code>, there is no easy way to flatten it.
For example: <code>[1, 2, 3, 4, [5, 6]]</code> is not easy to flatten. You need to write a custom recursive function. Not good. Avoid if you can.
But <code>[[1, 2, 3], [4, 5, 6]]</code> is easy to flatten, as it's has a type of <code>[[Int]]</code>.

If your array contains `Int` as well as `[Int]`, there is no easy way to flatten it.

For example: `[1, 2, 3, 4, [5, 6]]` is not easy to flatten. You need to write a custom recursive function. Not good. Avoid if you can.

But `[[1, 2, 3], [4, 5, 6]]` is easy to flatten, as it's has a type of `[[Int]]`.


Flatten an array

I'm an iOS developer, helping millennials with their finances through US neo-bank, Empower.
Before making the switch to development, I was a strategist and GM in the tech space.
