git.r.bdr.sh - rbdr/dotfiles/blob

   1 'use strict';
   2
   3 var value    = require('../../object/valid-value')
   4   , aFrom    = require('../from')
   5   , toArray  = require('../to-array')
   6   , contains = require('./contains')
   7   , byLength = require('./_compare-by-length')
   8
   9   , filter = Array.prototype.filter, push = Array.prototype.push;
  10
  11 module.exports = function (/*…lists*/) {
  12         var lists, seen, result;
  13         if (!arguments.length) return aFrom(this);
  14         push.apply(lists = [this], arguments);
  15         lists.forEach(value);
  16         seen = [];
  17         result = [];
  18         lists.sort(byLength).forEach(function (list) {
  19                 result = result.filter(function (item) {
  20                         return !contains.call(list, item);
  21                 }).concat(filter.call(list, function (x) {
  22                         return !contains.call(seen, x);
  23                 }));
  24                 push.apply(seen, toArray(list));
  25         });
  26         return result;
  27 };