'use strict';
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module.exports = function union(init) {
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if (!Array.isArray(init)) {
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throw new TypeError('arr-union expects the first argument to be an array.');
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}
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var len = arguments.length;
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var i = 0;
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while (++i < len) {
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var arg = arguments[i];
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if (!arg) continue;
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if (!Array.isArray(arg)) {
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arg = [arg];
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}
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for (var j = 0; j < arg.length; j++) {
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var ele = arg[j];
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if (init.indexOf(ele) >= 0) {
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continue;
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}
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init.push(ele);
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}
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}
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return init;
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};
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