Lua is a dynamic language and functions are just a kind of value that can be called with the () operator. So you don’t really need to forward declare the function so much as make sure that the variable in scope when you call it is the variable you think it is. This is not … Read more
A userdata is a garbage-collected value of an arbitrary size and content. You create one from the C API, with lua_newuserdata(), which creates and pushes it on the stack and gives you a pointer to its content to initialize as you see fit from C. It is very comparable to calling malloc(). A key distinction … Read more
You can hack it via the native, global search: Ctrl + Shift + F (to open global search) Use regex mode (check “regex” checkbox) In the searchbox, enter only a caret “^” (without the quotes) You may want to limit the search to a specific directory, via the “directory” tab Hit the “Open in Find … Read more
Semi-colons in Lua are generally only required when writing multiple statements on a line. So for example: local a,b=1,2; print(a+b) Alternatively written as: local a,b=1,2 print(a+b) Off the top of my head, I can’t remember any other time in Lua where I had to use a semi-colon. Edit: looking in the lua 5.2 reference I … Read more
Here is an implementation of a locals() function. It will return a table of locals from the calling scope: function locals() local variables = {} local idx = 1 while true do local ln, lv = debug.getlocal(2, idx) if ln ~= nil then variables[ln] = lv else break end idx = 1 + idx end … Read more
It’s elseif, not else if (notice the space). The error is because the interpreter expects an end to each else block. See the manual for more information.
— starts a single line comment, like # or // in other languages. So it’s equivalent to: a = 3; b = 5; c = a
Since you tagged the question as “Lua”, I’ll give you an answer in the context of this language. Introduction Lua is written in C (almost completely compatible with C89 standard; the incompatible features can be easily disabled, if needed, using compile-time switches) and has been designed to be easily integrated with C code. In the … Read more
You want this: object:addShape(unpack(values)) See also: http://www.lua.org/pil/5.1.html Here’s a complete example: shape = { addShape = function(self, a, b, c) print(a) print(b) print(c) end } values = {1, 2, 3} shape:addShape(unpack(values))
Which to use is a matter of preference and circumstance: as the # length operator was introduced in version 5.1, t[#t+1] = i will not work in Lua 5.0, whereas table.insert has been present since 5.0 and will work in both. On the other hand, t[#t+1] = i uses exclusively language-level operators, wheras table.insert involves … Read more