$ gnpm install array-union
Create an array of unique values, in order, from the input arrays
$ npm install array-union
import arrayUnion from 'array-union';
arrayUnion([1, 1, 2, 3], [2, 3]);
//=> [1, 2, 3]
arrayUnion(['foo', 'foo', 'bar']);
//=> ['foo', 'bar']
arrayUnion(['????', '????', '????'], ['????', '????']);
//=> ['????', '????', '????', '????']
arrayUnion(['????', '????'], ['????', '????'], ['????', '????', '????']);
//=> ['????', '????', '????', '????', '????']
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