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➜ MUSHclient
➜ Lua
➜ Question about the useage of the local function in module
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Question about the useage of the local function in module
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It is now over 60 days since the last post. This thread is closed.
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| Posted by
| Yeedoo
China (12 posts) Bio
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| Date
| Tue 21 Feb 2012 05:14 AM (UTC) Amended on Tue 21 Feb 2012 05:15 AM (UTC) by Yeedoo
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| Message
| In a module or package. What's the different with the function and the local function?
Just the local function cant be seen from outside the module?
I tried to setup a module with a local function
wang_test={}
function wang_test.foo1(str)
local _f=foo2 ()
_f()
end --function wang_test.foo1()
---------------------------------
local function foo2 ()
return function ()
print('This is my test')
end --
end --local function f_2
but When i use the module, i got that
attempt to call global 'foo2' (a nil value)
What's the problem? Thank you! | | Top |
|
| Posted by
| Twisol
USA (2,257 posts) Bio
|
| Date
| Reply #1 on Tue 21 Feb 2012 05:16 AM (UTC) |
| Message
|
Yeedoo said:
Just the local function cant be seen from outside the module?
That's all it does, yes. The function is assigned to a new local variable instead of the globals list. |
'Soludra' on Achaea
Blog: http://jonathan.com/
GitHub: http://github.com/Twisol | | Top |
|
| Posted by
| Yeedoo
China (12 posts) Bio
|
| Date
| Reply #2 on Tue 21 Feb 2012 05:42 AM (UTC) |
| Message
|
Twisol said:
The function is assigned to a new local variable instead of the globals list.
But the local function foo2 was called only in my module.
In the mushclient world,i just write thus
require'wang_test'
wang_test.foo1()
| | Top |
|
| Posted by
| Twisol
USA (2,257 posts) Bio
|
| Date
| Reply #3 on Tue 21 Feb 2012 06:18 AM (UTC) Amended on Tue 21 Feb 2012 06:19 AM (UTC) by Twisol
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| Message
| Oh, I see. I thought those were in separate files for some reason.
You can't use a local function (or a local anything, really) before it's been defined. A local can only be accessed from the point it's created up until its scope closes. A global can be used from anywhere, so long as it's been created first.
All you need to do is re-order your function definitions, or else pre-create the locals.
wang_test={}
local function foo2 ()
return function ()
print('This is my test')
end --
end --local function f_2
function wang_test.foo1(str)
local _f=foo2 ()
_f()
end --function wang_test.foo1()
|
'Soludra' on Achaea
Blog: http://jonathan.com/
GitHub: http://github.com/Twisol | | Top |
|
| Posted by
| Yeedoo
China (12 posts) Bio
|
| Date
| Reply #4 on Tue 21 Feb 2012 06:46 AM (UTC) |
| Message
|
Twisol said:
Oh, I see. I thought those were in separate files for some reason.
You can't use a local function (or a local anything, really) before it's been defined. A local can only be accessed from the point it's created up until its scope closes. A global can be used from anywhere, so long as it's been created first.
All you need to do is re-order your function definitions, or else pre-create the locals.
I got that! Thank you for so quick reply | | Top |
|
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