define(['./unique', './filter', './every', './contains', './slice'], function (unique, filter, every, contains, slice) { /** * Return a new Array with elements common to all Arrays. * - based on underscore.js implementation */ function intersection(arr) { var arrs = slice(arguments, 1), result = filter(unique(arr), function(needle){ return every(arrs, function(haystack){ return contains(haystack, needle); }); }); return result; } return intersection; });