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