Set works great when you are dealing with primitive values. But if you are working with some list of items (e.g. list of comment authors in this post), you're better off using a key mapping approach:
const mapping = {} const unique = array.filter((item) => { if (item.id in mapping) return false mapping[item.id] = true return true })
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Set works great when you are dealing with primitive values. But if you are working with some list of items (e.g. list of comment authors in this post), you're better off using a key mapping approach: