Task

Select certain elements from an Array into a new Array in a generic way.



To demonstrate, select all even numbers from an Array.

As an option, give a second solution which filters destructively,
by modifying the original Array rather than creating a new Array.




a[] = [ 1 2 3 4 5 6 7 8 9 ]
for i range len a[]
  if a[i] mod 2 = 0
    b[] &= a[i]
  .
.
print b[]