local Data = {
"Hello",
"World",
"Okay",
[0] = "Zero Entry",
[-1] = "Negative Entry (1)",
[-5] = "Negative Entry (5)",
[-4] = "Negative Entry (4)",
}
for i,v in Data do
print(i, v)
end
Example Two
local Data = {}
for i = -50, 100, 6 do
Data[i] = i
end
print(Data)
-- In this example, ipairs does not print the second loop while pairs does.
for _, value in Data do
print(value)
end
Expected Behavior
Example one: We expect that either we print from negative to positive, or that after going to the end of the positive end it indexes consistently through the negative.
Example two: We expect that the table is printed corrected and the same as example one.
Actual Behavior
Example one: It goes through the positive and doesn’t deal well with the negatives.
Example two: The table is printed correctly but unlike example A, the indexing goes between positive and negative at random.
Outside of the obvious not using negative values and using code like i = 1, #table do print(table[i]) end, there is no formal workaround. Although this is very much unintentional behaviour so shouldn’t be dealt with by the regular programmer.
Issue Area: Engine Issue Type: Other Impact: Moderate Frequency: Rarely
Negative indices are never considered array indices in Lua, so they’re always stored in the hash part like any other arbitrary key type (so they don’t have any particular order).
