WoW:API getglobal: Difference between revisions
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''Note: getglobal and [[API_setglobal|setglobal]] are deprecated and replaced with _G[]<ref>http://forums.worldofwarcraft.com/thread.html?topicId=25626580975&sid=1</ref>. Change all references of getglobal and setglobal:'' | |||
var = getglobal(varName) --getglobal deprecated | |||
var = _G[varName] --new syntax to get a global | |||
setglobal(otherName, otherVar) --setglobal deprecated | |||
_G[otherName] = otherVar --new syntax to set a global | |||
== Description == | |||
Get a global variable, from a string. | Get a global variable, from a string. | ||
local targetGlobal = getglobal("globalName") | local targetGlobal = getglobal("globalName") | ||
== Arguments == | |||
:("globalName") | :("globalName") | ||
:;globalName : String - Name of the global you want to get. | :;globalName : String - Name of the global you want to get. | ||
== Returns == | |||
:;The value from the given string, or nil if not found | :;The value from the given string, or nil if not found | ||
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Function calls always cost some overhead, so if a large number of getglobal calls are being made, the global table will be a faster route. Note that for few or infrequent calls the performance gain of this method is negligible (but given the lack of any loss of functionality, recommended). | Function calls always cost some overhead, so if a large number of getglobal calls are being made, the global table will be a faster route. Note that for few or infrequent calls the performance gain of this method is negligible (but given the lack of any loss of functionality, recommended). | ||
''Note:'' Accessing the global table through the function getfenv() was common within addons presumably because the global '_G' (the direct global table) was hidden from the WoW environment. It seems to have since been uncovered, and now calling it directly for global access is possible: | ''Note:'' Accessing the global table through the function getfenv() was common within addons presumably because the global '[[Dump_G|_G]]' (the direct global table) was hidden from the WoW environment. It seems to have since been uncovered, and now calling it directly for global access is possible: | ||
local _G = _G -- a local speeds up access to _G slightly. negligible for infrequent calls. | local _G = _G -- a local speeds up access to [[Dump_G|_G]] slightly. negligible for infrequent calls. | ||
local prevval = _G["MyVariable"] ''-- "getglobal()"'' | local prevval = _G["MyVariable"] ''-- "getglobal()"'' | ||
_G["MyVariable"] = 1234 ''-- "setglobal()"'' | _G["MyVariable"] = 1234 ''-- "setglobal()"'' | ||
Latest revision as of 04:45, 15 August 2023
Note: getglobal and setglobal are deprecated and replaced with _G[][1]. Change all references of getglobal and setglobal:
var = getglobal(varName) --getglobal deprecated var = _G[varName] --new syntax to get a global
setglobal(otherName, otherVar) --setglobal deprecated _G[otherName] = otherVar --new syntax to set a global
Description[edit]
Get a global variable, from a string.
local targetGlobal = getglobal("globalName")
Arguments[edit]
- ("globalName")
- globalName
- String - Name of the global you want to get.
Returns[edit]
- The value from the given string, or nil if not found
Details[edit]
This function is used to get an object if you generate the name of the object manually in your script:
-- i = some_dynamic_number
local curFrame = getglobal("myFrame"..i)
As of the introduction of getfenv() into the API (as well as direct access to the table _G as a global), setglobal() and getglobal() are somewhat superfluous. You can always do something along the lines of:
local _G = getfenv() local prevval = _G["MyVariable"] -- "getglobal()" _G["MyVariable"] = 1234 -- "setglobal()"
Function calls always cost some overhead, so if a large number of getglobal calls are being made, the global table will be a faster route. Note that for few or infrequent calls the performance gain of this method is negligible (but given the lack of any loss of functionality, recommended).
Note: Accessing the global table through the function getfenv() was common within addons presumably because the global '_G' (the direct global table) was hidden from the WoW environment. It seems to have since been uncovered, and now calling it directly for global access is possible:
local _G = _G -- a local speeds up access to _G slightly. negligible for infrequent calls. local prevval = _G["MyVariable"] -- "getglobal()" _G["MyVariable"] = 1234 -- "setglobal()"