selectRandom2 - select n random elements from list (in random order, no duplicates), return rest list also [1008665]

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< > BotCompany Repo | #1008665 // selectRandom2 - select n random elements from list (in random order, no duplicates), return rest list also

JavaX fragment (include)

// returns selected, rest
static <A> Pair<L<A>> selectRandom2(L<A> list, int n) {
  if (l(list) < n) null;
  new L<A> l;
  list = cloneList(list);
  repeat n {
    int i = rand(l(list));
    l.add(list.get(i));
    list.remove(i);
  }
  ret pair(l, list);
}

Author comment

Began life as a copy of #1002448

download show line numbers debug dex old transpilations

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Snippet ID:	#1008665
Snippet name:	selectRandom2 - select n random elements from list (in random order, no duplicates), return rest list also
Eternal ID of this version:	#1008665/4
Text MD5:	0eebaab529fa17dd815074c1b3695728
Author:	stefan
Category:	javax
Type:	JavaX fragment (include)
Public (visible to everyone):	Yes
Archived (hidden from active list):	No
Created/modified:	2017-05-27 14:03:47
Source code size:	268 bytes / 12 lines
Pitched / IR pitched:	No / No
Views / Downloads:	732 / 766
Version history:	3 change(s)
Referenced in:	[show references]

1	// returns selected, rest
2	static <A> Pair<L<A>> selectRandom2(L<A> list, int n) {
3	if (l(list) < n) null;
4	new L<A> l;
5	list = cloneList(list);
6	repeat n {
7	int i = rand(l(list));
8	l.add(list.get(i));
9	list.remove(i);
10	}
11	ret pair(l, list);
12	}