Common list elements: Difference between revisions

=={{header|Nim}}==

<lang Nim>import algorithm, sequtils

proc commonElements(list: openArray[seq[int]]): seq[int] =

var list = sortedByIt(list, it.len) # Start with the shortest array.

for val in list[0].deduplicate(): # Check values only once.

block checkVal:

for i in 1..list.high:

if val notin list[i]:

break checkVal

result.add val

echo commonElements([@[2,5,1,3,8,9,4,6], @[3,5,6,2,9,8,4], @[1,3,7,6,9]])</lang>

{{out}}

<pre>@[3, 6, 9]</pre>