underscore.js _.union[Array]

Computes the union of the passed-in arrays: the list of unique items, in order, that are present in one or more of the arrays.

返回数组中的并集

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

源码:

  _.union = function() {
    return _.uniq(_.flatten(arguments, true));
  };