← WoW Lua
From TableLibraryTutorial of lua-users.org.
table.sort(table [, compFunc]) sort(table[, compFunc])
Sort the elements of a table in-place (i.e. alter the table).
> t = { 3,2,5,1,4 }
> table.sort(t)
> = table.concat(t, ", ") -- display sorted values
1, 2, 3, 4, 5
If the table has a specified size only the range specified is sorted, e.g.,
> t = { 3,2,5,1,4; n=3 } -- construct a table with user size of 3
> table.sort(t) -- sort will be limited by user size
> = table.concat(t, ", ") -- only specified size is concatenated as well
2, 3, 5
- Warning: Setting the range of the sort is no longer possible since table.setn is no longer supported (setting n=3 will not set the size of the table to 3) Yssaril 05
- 31, 23 March 2008 (UTC)
A comparison function can be provided to customise the element sorting. The comparison function must return a boolean value specifying whether the first argument should be before the second argument in the sequence. The default behaviour is for the < comparison to be made. For example, the following behaves the same as no function being supplied:
> t = { 3,2,5,1,4 }
> table.sort(t, function(a,b) return a<b end)
> = table.concat(t, ", ")
1, 2, 3, 4, 5
We can see if we reverse the comparison the sequence order is reversed.
> table.sort(t, function(a,b) return a>b end) > = table.concat(t, ", ") 5, 4, 3, 2, 1
- Notes:
- Sorting tables containing non-numeric keys using a custom comparison function does not work. The function will not get called, and the table will be sorted according to some kind of internal function.
Sorting by Name
There is a user-function you can write that will sort a table by name during a for function.
function pairsByKeys (t, f)
local a = {}
for n in pairs(t) do table.insert(a, n) end
table.sort(a, f)
local i = 0 -- iterator variable
local iter = function () -- iterator function
i = i + 1
if a[i] == nil then return nil
else return a[i], t[a[i]]
end
end
return iter
end
This function will replace the pairs function in a for statement. Example:
for title,value in pairsByKeys(randomtable) do
DEFAULT_CHAT_FRAME:AddMessage(title..", "..value);
end
This will print all the variables in randomtable alphabetically!
