underscore.js _.intersect[Array]

Computes the list of values that are the intersection of all the arrays. Each value in the result is present in each of the arrays.

返回数组的交集

_.intersection([1, 2, 3], [101, 2, 1, 10], [2, 1]);
=> [1, 2]

源码:

_.intersection = _.intersect = function(array) {
var rest = slice.call(arguments, 1);
return _.filter(_.uniq(array), function(item) {
return _.every(rest, function(other) {
return _.indexOf(other, item) >= 0;
});
});
}