> Merging arrays (with and without duplicates)

Today, I ran into a situation where simply merging two arrays was not enough: the new array had to only include unique values. Let's see how I tackled it.

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Before: Using Spread Operator to Combine Arrays:

To merge two arrays and include all elements from both, we can use the Spread operator like this:

return [...arrayOne, ...arrayTwo];

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After: Using Set to Remove Duplicates:

To include only unique elements from each array, we can use Set:

return [...new Set([...arrayOne, ...arrayTwo])];

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Let's break down how this solution works:

1. First, we merge the two arrays using the spread operator - just like we did before:

   [...arrayOne, ...arrayTwo]

2. Then, we wrap the result in a new Set, which removes duplicates.

   new Set([...arrayOne, ...arrayTwo])

3. Finally, we convert the Set into an array using the spread operator.

   [...new Set([...arrayOne, ...arrayTwo])]