概述
and use it like this:
hello.mytest.test2()
These problems can be avoided by not using the module function but instead simply defining modules in the following simple way:
return M
and importing modules this way:
MT.test2()
A module containing a class with constructor (in the object-oriented sense) can be packaged in a number of ways in a module. Here is one reasonably good approach.[*2]
local M = {}; M.__index = M
local function construct()
local self = setmetatable({balance = 0}, M)
return self
function M:add(value) self.balance = self.balance + 1 end
return M
A module defined in this way typically only contains a single class (or at least a single public one), which is the module itself.
It can be used like this:
or even like this:
:
remove (filename (id))
end
Because "end" is a terminator for many different constructs, it can help the reader (especially in a large block) if a comment is used to clarify which construct is being terminated: [*3]
if type(v) == "string" then
...lots of code here...
end -- if string
end -- for each t
if line then -- instead of line ~= nil
...
end
...
if not line then -- instead of line == nil
...
end
However, if the variable tested can ever contain false as well, then you will need to be explicit if the two conditions must be differentiated: line == nil v.s. line == false.
and and or may be used for terser code:
x = x or "idunno"
-- rather than if x == false or x == nil then x = "idunno" end
print(x == "yes" and "YES!" or x)
-- rather than if x == "yes" then print("YES!") else print(x) end end
Clone a small table t (warning: this has a system dependent limit on table size; it was just over 2000 on one system):
Determine if a table t is empty (including non-integer keys, which #t ignores):
t[#t+1] = 1更快速
t[#t+1] = 1
rather than
table.insert(t, 1)
.
最后
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