Create array with same elements as in input array where all elements which
are also arrays are replaced with elements of resulting recursive
application of flatten function.
If argument is not an array, function returns the argument encapsulated in
an array.
Flatten nested arrays.
Create array with same elements as in input array where all elements which are also arrays are replaced with elements of resulting recursive application of flatten function.
If argument is not an array, function returns the argument encapsulated in an array.