“attempt to index a nil value”-error in Lua
You’re not returning anything from your function call. Also, use local variables inside functions.
lua
What is a good game engine that uses Lua?
Game engines that use Lua Free unless noted Agen (2D Lua; Windows) Amulet (2D Lua; Window, Linux, Mac, HTML5, iOS) Cafu 3D (3D C++/Lua) Cocos2d-x (2D C++/Lua/JS; Windows, Linux, Mac, iOS, Android, BlackBerry) Codea (2D&3D Lua; iOS (Editor is iOs app); $14.99 USD) Cryengine by Crytek (3D C++/Lua; Windows, Mac) Defold (2D Lua; Windows, Linux, Mac, iOS, Android, Web, Switch) gengine (2D Lua; Windows, Linux, HTML5) Irrlicht (3D C++/.NET/Lua; Windows, Linux, Mac) Leadwerks (3D C++/C#/Delphi/BlitzMax/Lua; Windows; $199.95 … Read more
How to remove a lua table entry by its key?
No, setting the key’s value to nil is the accepted way of removing an item in the hashmap portion of a table. What you’re doing is standard. However, I’d recommend not overriding table.remove() – for the array portion of a table, the default table.remove() functionality includes renumbering the indices, which your override would not do. If you do want … Read more
Lua string.format options
string.format in Lua follows the same patterns as Printf in c: http://www.cplusplus.com/reference/clibrary/cstdio/printf/ There are some exceptions, for those see here: http://pgl.yoyo.org/luai/i/string.format
Lua replacement for the % operator
It’s not ideal, but according to the Lua 5.2 Reference Manual: a % b == a – math.floor(a/b)*b
Split a string using string.gmatch() in Lua
By adding one extra ; at the end of the string, the string now becomes “one;two;;four;”, everything you want to capture can use the pattern “([^;]*);” to match: anything not ; followed by a ;(greedy). Test: Output:
Concatenation of strings in Lua
As other answers have said, the string concatenation operator in Lua is two dots. Your simple example would be written like this: However, there is a caveat to be aware of. Since strings in Lua are immutable, each concatenation creates a new string object and copies the data from the source strings to it. That … Read more
Lua Program Delay
The os.clock function returns the number of seconds of CPU time for the program. So the sleep function of yours waits for n seconds, if you need to delay 2 minutes, just call: Note that there are some better solutions to implement sleep functions other than busy waiting, see Sleep Function for detail.
Logitech/LGHUB Lua – Loop with break
Step 1.Make sure you’re not using MB#4 (“backward”) in the game.If some action is assigned to MB#4 in the game, do the following: choose keyboard button you don’t currently use in the game (for example, F12) goto GHUB(KEYS tab); bind F12 to your physical MB#4 goto game options; bind the action to F12 instead of MB#4 Now when you press … Read more