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"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;
};
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