28 Jul Roberto Ierusalimschy & Luiz Henrique de Figueiredo & Waldemar Celes. 1. Lua Reference Manual. Abstract. Lua Reference Manual. Roberto Ierusalimschy,. Luiz Henrique de Figueiredo ,. Waldemar Celes. March 26, 1 – Introduction. Lua is an extension. Reference Manual. By Roberto Ierusalimschy, Luiz Henrique de Figueiredo , Waldemar Celes. Original version available at

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Lua Reference Manual

If locale is the empty string, the current locale is set to an implementation-defined native eeference. Environments associated with userdata have no meaning for Lua. A valid line is a line with some associated code, that is, a line where you can put a break point.

Creates and returns a referencein the table at index tfor the object at the top of the stack and pops the object. If rdference is a table, then lua 5.1 reference manual table is queried for every match, using the lua 5.1 reference manual capture as the key; if the pattern specifies no captures, then the whole match is used as the key.

Each call to func must return a string that concatenates with previous results.

This means that all values can be stored in variables, passed as arguments to other functions, and returned as results. This set includes assignments, control structures, function calls, and variable declarations. The garbage-collector pause controls how long the collector waits before starting a new cycle. Extra arguments passed to coroutine. All API lua 5.1 reference manual and related types and constants are declared in the header file lua. The reference ref is also freed to be lua 5.1 reference manual again.


If you need to go deeper e. Otherwise, if both arguments are strings, then their values are compared according to the current locale. Functions and Types 3. Local variables can be declared anywhere inside a block. All values returned lua 5.1 reference manual func are discarded.

The reader must return a pointer to a block of memory with a new piece of the chunk and set size to the block size. In both cases pushes onto the stack the final value associated with tname in the registry. Creates a new coroutine, with body f. Checks whether the function argument narg is a number and returns this number. Different objects will give different pointers. A call of the form lua 5.1 reference manual string ‘ or f” string ” or f[[ string ]] is syntactic sugar for f ‘ string ‘ ; that is, the argument list is a single literal string.

Lua 5.1 reference manual string library provides all its functions inside the table string. Before starting to run the script, lua collects all arguments in the command line in a global table called arg. Creates and returns a referencein the table at 5.11 tfor the object at the top of the stack and pops the object. If the registry already has the key tnamereturns 0. Cannot be called with a pseudo-index, because a pseudo-index is not an actual stack position.

Lua 5.1 reference manual the index of the top element in the stack. The type lua 5.1 reference manual implements associative arrays, that is, arrays that can be indexed not only with numbers, but with any value except nil. ANSI C ensures both behaviors. Nested Lua functions are created sharing the environment of the creating Lua function. The third field, xtells whether the function may throw errors: When called with a file handle, it simply sets this file handle as the default input file.


This is considered good programming practice. Because of the lexical scoping rules, local variables can be freely accessed by functions defined inside their scope.

All lua 5.1 reference manual used in these descriptions rawgettonumberetc. Blueprints Visual Scripting for Unreal Engine: Typically, the error handler function is used to add more debug information to the error message, such as a stack traceback. The hook is called just after Lua enters the new function, before the function gets its arguments.

Pops a value from the stack and sets it as the new value of global name. Like indices, the value of a table field can be of any type except nil.

Lua 5.1 Reference Manual

Creates a new Lua state. The type of numbers in Lua. Contents 1 – Introduction 2 – The Language 2.