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Posted by

Yeedoo China (12 posts)

bio

Date

Tue 21 Feb 2012 06:46 AM (UTC) [ quote ]

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

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Posted by Twisol USA (2,230 posts) bio

Date

Tue 21 Feb 2012 06:18 AM (UTC) [ quote ]

Amended on Tue 21 Feb 2012 06:19 AM (UTC) by Twisol

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

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Posted by Yeedoo China (12 posts) bio

Date Tue 21 Feb 2012 05:42 AM (UTC) [ quote ]

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()

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Posted by

Twisol USA (2,230 posts)

bio

Date

Tue 21 Feb 2012 05:16 AM (UTC) [ quote ]

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

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Posted by Yeedoo China (12 posts) bio

Date

Tue 21 Feb 2012 05:14 AM (UTC) [ quote ]

Amended on Tue 21 Feb 2012 05:15 AM (UTC) by Yeedoo

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!

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