New implementation

Be concise.

Be useful.

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Please try to avoid dependencies to third-party libraries and frameworks.

Other implementations
  integer, dimension(:), allocatable :: a
  allocate (a(n))
a := make([]T, n)
  a: array of some_type;
  SetLength(a, n);
    my @a = (undef) x $n;
    # scope ends at closing brace
def func():
    a = [0] * n
    # local variable automatically deallocated at end of function
a =
let a = vec![0; n];