select
Returns items in a list
Prototype
items = select (index, ...)Description
If index is a number, returns all items in the list from that number onwards. Otherwise index must be the string "#", in which case it returns the number of items in the list. This can be used to simulate the behaviour of the old "arg" feature in Lua 5.0, for use with variable numbers of arguments passed to a function.
function f (...)
print (select ("#", ...)) --> 4
print (select (2, ...)) --> 20 30 40
end -- f
f (10, 20, 30, 40)
Lua functions
- assert - Asserts that condition is not nil and not false
- collectgarbage - Collects garbage
- dofile - Executes a Lua file
- error - Raises an error message
- gcinfo - Returns amount of dynamic memory in use
- getfenv - Returns the current environment table
- getmetatable - Returns the metatable for the object
- ipairs - Iterates over a numerically keyed table
- load - Loads a chunk by calling a function repeatedly
- loadfile - Loads a Lua file and parses it
- loadlib - Loads a DLL (obsolete in Lua 5.1)
- loadstring - Compiles a string of Lua code
- module - Creates a Lua module
- next - Returns next key / value pair in a table
- pairs - Traverse all items in a table
- pcall - Calls a function in protected mode
- print - Prints its arguments
- rawequal - Compares two values for equality without invoking metamethods
- rawget - Gets the value of a table item without invoking metamethods
- rawset - Sets the value of a table item without invoking metamethods
- require - Loads a module
- setfenv - Sets a function's environment
- setmetatable - Sets the metatable for a table
- tonumber - Converts a string (of the given base) to a number
- tostring - Converts its argument to a string
- type - Returns the type of a variable
- unpack - Unpacks a table into individual items
- xpcall - Calls a function with a custom error handler
Topics
- Lua PCRE regular expression functions
- Lua base functions
- Lua bc (big number) functions
- Lua bit manipulation functions
- Lua coroutine functions
- Lua debug functions
- Lua io functions
- Lua math functions
- Lua os functions
- Lua package functions
- Lua script extensions
- Lua string functions
- Lua syntax
- Lua table functions
- Lua utilities
- Scripting callbacks - plugins
- Scripting