table.deduplicate(d)

[Sainan]

Removes duplicate values from a table

[well-in-that-case]

Seems like a niche enough operation for filter + another table to handle tbh

[Sainan]

Ehhh

table.uniques = function(t)
    local seen = {}
    t:filter(function(x)
        if seen:contains(x) then return false end
        seen:insert(x)
        return true
    end)
    return t
end

[Sainan]

Although might need a different name such as table.deduplicate or table.dedup so we can have table.deduplicated or table.deduped for the copying variant.

[Sainan]

Somewhat worth noting that now this can be emulated as followed on 0.10.0:

local t = { "foo", "foo", "bar" }
print(dumpvar(t:countvalues():keys())) -- { "foo", "bar" }

Although probably still worthwhile to have its own function.