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Best shallow copy of array?

When I was reading the vue source code today, I encountered a writing method that I didn't understand.
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const deduped = [...new Set(pendingPostFlushCbs)]

In my opinion, it is a shallow copy of the array. But why should I convert to Set first，can I have better performance? How should I understand it?

almost 4 years ago · Santiago Trujillo

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Accepted Answer · 2022-09-30T13:51:03.305Z

With Set you remove duplicates:

pendingPostFlushCbs = [1,2,5,5,6,8,8,]
const deduped = [...new Set(pendingPostFlushCbs)]
const deduped1 = [...pendingPostFlushCbs]
console.log(deduped)
console.log(deduped1)

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Best shallow copy of array?

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Andres GPT