what is D's idiom of Python's list.extend(another_list)?

[Ali Çehreli]

On 6/20/21 10:36 PM, mw wrote:
> i.e append an array of elements into another array:
> 
> 
> ```Python
> x = [1, 2, 3]
> x.extend([4, 5])
> print(x)  # [1, 2, 3, 4, 5]
> ```
> 
> Thanks.

There is also std.range.chain, which can visit multiple ranges in 
sequence without copying elements. This is a lifesaver when the arrays 
are very large.

import std.range;
import std.algorithm;

void main() {
   auto a = [ 1, 2, 3 ];
   auto b = [ 4, 5 ];
   auto expected = iota(1, 6);
   assert(chain(a, b).equal(expected));
}

Ranges can be very useful e.g. to sort elements of different random 
access ranges:

import std.range;
import std.algorithm;

void main() {
   auto a = [ 5, 1, 3 ];
   auto b = [ 4, 2 ];
   auto expected = iota(1, 6);

   // This time we sort:
   assert(chain(a, b).sort.equal(expected));

   // What? :)
   assert(a == [ 1, 2, 3]);
   assert(b == [ 4, 5 ]);
}

Ali