I came across an error: attempt to compare boolean with number with the following code:
local x = get_x_from_db() -- x maybe -2, -1 or integer like 12345
if 0 < x < 128 then
-- do something
end
What causes this error? Thanks.
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2 Answers
writing 0 < x < 128 is okay in Python, but not in Lua.
So, when your code is executed, Lua will first calculate if 0 < x is true. If it is true, then the comparison becomes true < 128, which is obviously the reason of the error message.
To make it work, you have to write:
if x < 128 and x > 0 then
--do something
end
Comments
0 < x < 128 is equivalent to (0 < x) < 128), hence the error message.
Write the test as 0 < x and x < 128.
