Re: Simple Pascal question

On 8/5/2024 8:34 AM, Michael S wrote:

On Sun, 4 Aug 2024 21:00:35 -0400
Arne Vajhøj <arne@vajhoej.dk> wrote:

On 8/4/2024 8:09 PM, Dan Cross wrote:

In article <v8o4h8$2ut3$1@dont-email.me>,
Arne Vajhøj  <arne@vajhoej.dk> wrote:

Like:
>
public class FlexArray {
      private static void dump(int[] a) {
          for(int v : a) {
              System.out.printf(" %d", v);
          }
          System.out.println();
      }
      public static void main(String[] args) throws Exception {
          int[] a1 = { 1 };
          int[] a2 = { 1, 2 };
          int[] a3 = { 1, 2, 3 };
          dump(a1);
          dump(a2);
          dump(a3);
      }
}

>
Java arrays are more like the aforementioned slices.

>
I don't think so.
>
Java does not have anything like slices.
>
C# does.

 >>

C# Span is similar to slices. But C# Span and C# array are far from
the same.

 Pay attention that despite being designed (or at least brought to
public) in this century, C# originally lacked slices.
They were added relatively recently, in v. 8.0, and referred in c# docs
as "Indices and ranges".

I thought it was C# 7.2.
It is important to note that C# Span and Range are
a little bit different than similar syntax in some of
the newer native languages supporting slice.
int[] a = { 10, 20, 30, 40, 50, 60, 70, 80, 90, 100 };
Span<int> s1 = a[1..3];
does not create a span/slice/view of the second and third
element of a - it allocates a new array of length 2,
copy the second and third element of a to it and
create a span/slice/view of the new array.
Span<int> s2 = ((Span<int>)a).Slice(1, 2);
Span<int> s3 = (new Span<int>(a)).Slice(1, 2);
Span<int> s4 = new Span<int>(a, 1, 2);
all create a span/slice/view of the second and third
element of a.
Arne