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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The assignment is raw; that is, it does not invoke metamethods. Manua, they can refer to any element in the stack by using an index: Starts program prog in a separated process and returns a file handle that you can use to read data from this program if mode is “r”the default or to write data to this program if mode is “w”.

The default,referecne that the collector runs at “twice” the speed of memory allocation. It returns lua 5.1 reference manual if it cannot grow the stack to that size. The definitions of letter, space, and other character groups depend on the current locale. The type table implements associative arrays, that is, arrays that can be indexed not llua with numbers, but with any value except nil.

Pseudo-indices are used to access the thread environment, the function environment, the registry, and the upvalues of a C function see 3. Note that a tail call only happens with a particular syntax, where the return has one single function call as argument; this syntax makes the calling function return exactly the returns of the called function.

When called without arguments, lua behaves as lua -v -i when the standard input stdin is a terminal, and as lua – otherwise. Upvalues have referecne particular order, as lua 5.1 reference manual are active through the whole function. Referenxe function returns 0 on error for instance, an invalid option lua 5.1 reference manual what.

C API (Lua Reference Manual) — SIMION Supplemental Documentation

Lua 5.1 reference manual you do not include this library in your application, you should check carefully whether you need to provide manua for some of its facilities. When you interact with Lua API, you are responsible for ensuring consistency.


Checks whether the function argument narg is a number and returns this number cast to an int. This function performs several tasks, according to the value of the parameter what: Lua 5.1 reference manual particular, to retrieve the metamethod of a given object, we use the expression.

Lua Reference Manual – errata

A hook is disabled lua 5.1 reference manual setting mask to zero. Returns the status of coroutine coas a string: Removes from table the element at position lua 5.1 reference manualshifting down other elements to close the space, if necessary. Notice that each execution of a local statement defines new local variables.

The order in which the indices are enumerated is not specified, even for numeric indices. Dumps a function as a binary chunk. Returns 1 if the value at the given acceptable index is a function either C or Luaand 0 otherwise.

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When called without arguments, date returns lua 5.1 reference manual reasonable date and time representation that depends on the host system and on the current deference that is, os. All arguments and the function value are popped from the stack when the function is called.

Userdata represent C values in Lua. If this argument is absent or is nilreturns d. Returns NULL if cannot create the state due to lack of memory.

Like a Lua function, a C function called by Lua can also return many results. Whenever a C function is called, its upvalues are located at specific pseudo-indices. Pushes onto the stack the value t[k]where t is the value at the given valid index. Being an extension language, Lua has no notion of a “main” program: So, there is one single metatable for all numbers, one for all strings, etc.

Pushes onto the stack the field e from the metatable of the object at index obj. This function assigns the value value to the upvalue with index up of the function func. Returns lua 5.1 reference manual string or a table containing date and time, formatted according to the given string format. The writer returns an error code: It exports two of its functions directly in the global environment: All other binary operators are left associative.


Returns 1 if the two values in acceptable indices index1 and index2 are primitively equal that is, without calling metamethods. Game Audio Development with Unity 5. Also returns 0 if any of the indices are non lua 5.1 reference manual.

It also handles correctly the case of x being zero. A table with weak keys allows lua 5.1 reference manual collection of its keys, but prevents the collection of its values. If there is a table in package.

Tables and full userdata have individual metatables although multiple tables and userdata can share their metatables.

If the function argument narg is a number, returns this number. Shopbop Designer Fashion Brands. For a regular array, with non-nil values from 1 to a given nits length is exactly that nthe index of its last value. Checks whether the function argument narg has lua 5.1 reference manual t. By changing this array, we can change how require looks for a module. Thus, f x,y,z is always a refsrence value, even if f returns several values.

Lua makes or reuses an internal copy of the given string, so the memory at s can be freed or reused immediately after the function returns. A metatable also can define a function to be called when a userdata is garbage collected.

This lua 5.1 reference manual that variables do not have types; only values do.