| "use strict"; |
| |
| var value = require("../../object/valid-value") |
| , aFrom = require("../from") |
| , toArray = require("../to-array") |
| , contains = require("./contains") |
| , byLength = require("./_compare-by-length") |
| , filter = Array.prototype.filter |
| , push = Array.prototype.push; |
| |
| module.exports = function (/* …lists*/) { |
| var lists, seen, result; |
| if (!arguments.length) return aFrom(this); |
| push.apply((lists = [this]), arguments); |
| lists.forEach(value); |
| seen = []; |
| result = []; |
| lists.sort(byLength).forEach(function (list) { |
| result = result |
| .filter(function (item) { return !contains.call(list, item); }) |
| .concat(filter.call(list, function (item) { return !contains.call(seen, item); })); |
| push.apply(seen, toArray(list)); |
| }); |
| return result; |
| }; |
