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Lua - variable function arguments and select

Lua's select function allows you to look at the variable arguments to your current function. If you're going to be calling a function from different places with different numbers of parameters, you can declare the function with its final parameter being "..." which sucks up the final parameters into an indexed table. However, #... to find out how long the extra table is contravenes the syntax rules of Lua, and that's where select comes in.

Looking at the various Lua books and sources, there's very little on select - it's a bit of an obscure corner - so I've added a full source example - [here] - on our web site.

Remember that you can also pass named parameters into a function in the form of a table - that's done by calling the function with curly braces rather than round brackets. That's included within a somewhat more complex example [here].
(written 2010-09-08, updated 2010-09-14)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
U106 - Lua - Functions.
  [3695] Functions are first class variables in Lua and Python - (2012-04-13)
  [2723] Returning multiple values from a function - Lua - (2010-04-15)
  [2455] Lua examples - coroutines, error handling, objects, etc - (2009-10-15)
  [2356] Passing multiple results back from a function - Lua, Python, etc - (2009-08-13)
  [2347] Dot, dot, dot in Lua - variable length parameter lists - (2009-08-11)
  [2312] What are closures in Lua? - (2009-07-31)
  [1847] Lua - IAQ (Infrequently Answered Questions) - (2008-10-18)
  [1744] Lua examples, Lua Courses - (2008-08-08)
  [1743] First class functions in Lua lead to powerful OO facilities - (2008-08-07)
  [1699] If you are learning Lua, here are some more examples - (2008-07-06)
  [1697] Sorting in lua - specifying your own sort routine - (2008-07-05)
  [1685] Short circuit evaluation (lazy operator) in Lua - (2008-06-22)


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