How to reorder sequence

Hi,
how to reorder a sequence? Lets say I have a sequence:
var s1 = [10,20,30,40,50];and I would like to reorder the sequence by index (the 1st element goes to 2nd position...)
var s2 = s1[3,1,2,5,4];to get
s2 = 30 10 20 50 40Is there any simple way to do that? I know I can do s1[1..2] but that's for ranges. Instead I would like to directly specify ordering of the new sequence
Thanks for you help ;)
Best regards,
Oldrich Svec

Thank you for your quick answer. But unfortunately it looks like you copy all elements of the array which is not necessary as I would like to change the sequence (pointer array), not the array elements themselves.
I have read about sequences that when adding elements to already existing sequence (or changing sequence any other way), new sequence (array of pointers?) is created consisting of old array elements + new element. So you do not actually touch the old elements at all. And I would like to do the same. Leave old array as it is and just to change sequence (array of pointers)
Try to run this code:
var s1 = [1..100000];
for(i in [0..10000]) {
s1 = for (idx in [1..100000]) s1[idx - 1];
}I get out of memory. and my question is why? I would like to have 1 array only and just to change sequence pointing to it...
Thanks for help
Oldrich

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