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- _G () holds global environment, setfenv changes environments
- _VERSION current interpreter version "Lua 5.1"
- assert (v [, message]) error if v nil or false, otherwise returns v
- bit.arshift(x, n) arithmetic right-shift
- bit.band(x1 [,x2...]) bitwise 'and' of arguments
- bit.bnot(x) bitwise 'not' of argument
- bit.bor(x1 [,x2...]) bitwise 'or' of arguments
- bit.bswap(x) swaps the bytes of the argument (32-bit little-endian/big-endian)
- bit.bxor(x1 [,x2...]) bitwise 'xor' of arguments
- bit.lshift(x, n) logical left-shift
- bit.rol(x, n) bitwise left rotation
- bit.ror(x, n) bitwise right rotation
- bit.rshift(x, n) logical right-shift
- bit.tohex(x [,n]) Converts its first argument to a hex string
- collectgarbage ([limit]) set threshold to limit KBytes, default 0, may run GC
- coroutine.create (f) creates coroutine from function f, returns coroutine
- coroutine.resume (co, val1, ...) continues execution of co, returns bool status plus any values
- coroutine.status (co) returns co status: "running", "suspended" or "dead"
- coroutine.wrap (f) creates coroutine with body f, returns function that resumes co
- coroutine.yield (val1, ...) suspend execution of calling coroutine
- debug.debug () enters interactive debug mode, line with only "cont" terminates
- debug.gethook () returns current hook function, hook mask, hook count
- debug.getinfo (function [, what]) returns table with information about a function
- debug.getlocal (level, local) returns name and value of local variable with index local at stack level
- debug.getupvalue (func, up) returns name and value of upvalue with index up of function func
- debug.sethook (hook, mask [, count]) sets given function as a hook, mask="[crl]"
- debug.setlocal (level, local, value) sets local variable with index local at stack level with value
- debug.setupvalue (func, up, value) sets upvalue with index up of function func with value
- debug.traceback ([message]) returns a string with a traceback of the call stack
- dofile (filename) executes as Lua chunk, default stdin, returns value
- error (message [, level]) terminates protected func, never returns, level 1 (default), 2=parent
- file:close () closes file
- file:flush () saves any written data to file
- file:lines () returns iterator function to return lines, nil ends
- file:read (format1, ...) reads file according to given formats, returns read values or nil
- file:seek ([whence] [, offset]) sets file pos, whence="set"|"cur"|"end", defaults "curr",0, returns file pos
- file:write (value1, ...) writes strings or numbers to file
- gcinfo () returns dynamic mem in use (KB), and current GC threshold (KB)
- getfenv (f) gets env, f can be a function or number (stack level, default=1), 0=global env
- getmetatable (object) returns metatable of given object, otherwise nil
- io.close ([file]) closes file, or the default output file
- io.flush () flushes the default output file
- io.input ([file]) opens file in text mode, sets as default input file, or returns current default input file
- io.lines ([filename]) open file in read mode, returns iterator function to return lines, nil ends
- io.open (filename [, mode]) opens file in specified mode "[rawb+]", returns handle or nil
- io.output ([file]) opens file in text mode, sets as default output file, or returns current default output file
- io.read (format1, ...) reads file according to given formats, returns read values or nil
- io.stderr file descriptor for STDERR
- io.stdin file descriptor for STDIN
- io.stdout file descriptor for STDOUT
- io.tmpfile () returns a handle for a temporary file, opened in update mode
- io.type (obj) returns "file" if obj is an open file handle, "close file" if closed, or nil if not a file handle
- io.write (value1, ...) writes strings or numbers to file
- ipairs (t) returns an iterator function, table t and 0
- loadfile (filename) loads chunk without execution, returns chunk as function, else nil plus error
- loadlib (libname, funcname) links to dynamic library libname, returns funcname as a C function
- loadstring (string [, chunkname]) loads string as chunk, returns chunk as function, else nil plus error
- math.abs (v) returns absolute value of v
- math.acos (v) returns arc cosine value of v in radians
- math.asin (v) returns arc sine value of v in radians
- math.atan (v) returns arc tangent value of v in radians
- math.atan2 (v1, v2) returns arc tangent value of v1/v2 in radians
- math.ceil (v) returns smallest integer >= v
- math.cos (rad) returns cosine value of angle rad
- math.deg (rad) returns angle in degrees of radians rad
- math.exp (v) returns e^v
- math.floor (v) returns largest integer <= v
- math.frexp (v) returns mantissa [0.5,1) and exponent values of v
- math.ldexp (v1, v2) returns v1*2^v2
- math.log (v) returns natural logarithm of v
- math.log10 (v) returns logarithm 10 of v
- math.max (v1, ...) returns maximum in a list of one or more values
- math.min (v1, ...) returns minimum in a list of one or more values
- math.mod (v1, v2) returns remainder of v1/v2 which is v1 - iV2 for some integer i
- math.pow (v1, v2) returns v1 raised to the power of v2
- math.rad (deg) returns angle in radians of degrees deg
- math.random ([n [, u]]) returns random real [0,1), integer [1,n] or real [1,u] (with n=1)
- math.randomseed (seed) sets seed for pseudo-random number generator
- math.sin (rad) returns sine value of angle rad
- math.sqrt (v) returns square root of v
- math.tan (rad) returns tangent value of angle rad
- next (table [, index]) returns next index,value pair, if index=nil (default), returns first index
- os.clock () returns CPU time used by program in seconds
- os.date ([format [, time]]) returns a string or table containing date and time, "*t" returns a table
- os.difftime (t2, t1) returns number of seconds from time t1 to time t2
- os.execute (command) executes command using C function system, returns status code
- os.exit ([code]) terminates host program with optional code, default is success code
- os.getenv (varname) returns value of environment variable varname. nil if not defined
- os.remove (filename) deletes file with given name, nil if fails
- os.rename (oldname, newname) renames file oldname to newname, nil if fails
- os.setlocale (locale [, category]) set current locale of program, returns name of new locate or nil
- os.time ([table]) returns current time (usually seconds) or time as represented by table
- os.tmpname () returns a string with a filename for a temporary file (dangerous! tmpfile is better)
- pairs (t) returns the next function and table t plus a nil, iterates over all key-value pairs
- pcall (f, arg1, arg2, ...) protected mode call, catches errors, returns status code first (true=success)
- print (e1, e2, ...) prints values to stdout using tostring
- rawequal (v1, v2) non-metamethod v1==v2, returns boolean
- rawget (table, index) non-metamethod get value of table[index], index != nil
- rawset (table, index, value) non-metamethod set value of table[index], index != nil
- require (packagename) loads package, updates _LOADED, returns boolean
- setfenv (f, table) sets env, f can be a function or number (stack level, default=1), 0=global env
- setmetatable (table, metatable) sets metatable, nil to remove metatable
- string.byte (s [, i]) returns numerical code, nil if index out of range, default i=1
- string.char (i1, i2, ...) returns a string built from 0 or more integers
- string.dump (function) returns binary representation of function, used with loadstring
- string.find (s, pattern [, init [, plain]]) matches pattern in s, returns start,end indices, else nil
- string.format (formatstring, e1, e2, ...) returns formatted string, printf-style
- string.gfind (s, pat) returns iterator function that returns next captures from pattern pat on s
- string.gsub (s, pat, repl [, n]) returns copy of s with pat replaced by repl, and substitutions made
- string.len (s) returns string length
- string.lower (s) returns string with letters in lower case
- string.rep (s, n) returns string with n copies of string s
- string.sub (s, i [, j]) returns substring from index i to j of s, default j=-1 (string length)
- string.upper (s) returns string with letters in upper case
- table.concat (table [, sep [, i [, j]]]) returns concatenated table elements i to j separated by sep
- table.foreach (table, f) executes f(index,value) over all elements of table, returns first non-nil of f
- table.foreachi (table, f) executes f(index,value) in sequential order 1 to n, returns first non-nil of f
- table.getn (table) returns size of table, or n field, or table.setn value, or 1 less first index with nil value
- table.insert (table, [pos,] value) insert value at location pos in table, default pos=n+1
- table.remove (table [, pos]) removes element at pos from table, default pos=n
- table.setn (table, n) sets size of table, n field of table if it exists
- table.sort (table [, comp]) sorts in-place elements 1 to n, comp(v1,v2) true if v1<v2, default <
- tonumber (e [, base]) convert to number, returns number, nil if non-convertible, 2<=base<=36
- tostring (e) convert to string, returns string
- type (v) returns type of v as a string
- unpack (list) returns all elements from list
- xpcall (f, err) pcall function f with new error handler err
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