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module.exports = union;

/*

union([1, 2, 5, 6], [2, 3, 4, 6]); // [1, 2, 3, 4, 5, 6]

*/

function union(arr1, arr2) {

if (!Array.isArray(arr1) || !Array.isArray(arr2)) {

throw new Error('expected both arguments to be arrays');

}

var result = arr1.concat([]);

var len = arr2.length;

for (var i = 0; i < len; i++) {

var elem = arr2[i];

if (arr1.indexOf(elem) == -1) {

result.push(elem);

}

}

return result;

}

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