# # `union()`

The union method adds the given array to the collection. If the given array contains keys that are already in the original collection, the original collection's values will be preferred:

    const collection = collect({
      a: "A",
      b: "B"
    });

    const union = collection.union({
      a: "AAA",
      c: "CCC",
      b: "BBB"
    });

    union.all();

    //=> {
    //=>   a: 'A',
    //=>   b: 'B',
    //=>   c: 'CCC',
    //=> }

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