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Lua patterns deliberately lack the most complex regular expression constructs (to avoid bloating the Lua code base), where many other computer languages or libraries use a more complete set. Lua patterns are not even a subset of regular expressions, as there are also discrepancies, like Lua using the escape character % instead of \, , and ...
Lua is dynamically typed. There's no static typing at all. From a syntactic point of view, think BASIC (or even COMAL) without line numbers and colons rather than C/C++/Java, Lisp/Scheme, or Forth. There's no begin, but most control structures have an end; for needs a do and if needs a then. {...} denote a table (expression), not a block of code.
Lua functions may pass varargs to other functions the same way as other values using the return keyword. tables can be passed into variadic functions by using, in Lua version 5.2 or higher [9] table.unpack, or Lua 5.1 or lower [10] unpack. Varargs can be used as a table by constructing a table with the vararg as a value.
Marshalling data between C and Lua functions is also done using the stack. To call a Lua function, arguments are pushed onto the stack, and then the lua_call is used to call the actual function. When writing a C function to be directly called from Lua, the arguments are read from the stack. Here is an example of calling a Lua function from C:
Help:Lua for beginners; Help:Lua debugging – about debugging Lua modules; Wikipedia:Lua style guide – standards to improve the readability of code through consistency; Module:Sandbox provides a pseudo-namespace for experimenting with Lua modules
Lua code in Scribunto is only run when the page is being parsed. Therefore, the only user input that Lua can receive is by page editing – it cannot create a box that calculates the square root of a number you type in, or recalculate a piece of the Mandelbrot set depending on which part of the parent set you click on. The input Lua can receive ...
The above statements can also be classified by whether they are a syntactic convenience (allowing things to be referred to by a shorter name, but they can still be referred to by some fully qualified name without import), or whether they are actually required to access the code (without which it is impossible to access the code, even with fully ...
Aerospike Database uses Lua as its internal scripting language for its 'UDF' (User Defined Function) capabilities, similar to procedures; Apache HTTP Server can use Lua anywhere in the request process (since version 2.3, via the core mod_lua module).