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For 2021 - online Python 3 training - see ((here)).

Our plans were to retire in summer 2020 and see the world, but Coronavirus has lead us into a lot of lockdown programming in Python 3 and PHP 7.
We can now offer tailored online training - small groups, real tutors - works really well for groups of 4 to 14 delegates. Anywhere in the world; course language English.

Please ask about private 'maintenance' training for Python 2, Tcl, Perl, PHP, Lua, etc.
Sorting in lua - specifying your own sort routine

In Lua, the table.sort function allows you to sort a table and by default is sorts into the order that's given back by the < operator on each of the objects to be sorted. If you want to override this behaviour, you can pass the name of a function into Lua's sort and it will call this function each time a comparison is needed.

In order to help demonstrate this, I wrote a sample program with my own sort routine which I called "mysort" - as a direct replacement for table.sort with two parameters - table and function.

You can see the source code here.
(written 2008-07-05)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
U106 - Lua - Functions.
  [1685] Short circuit evaluation (lazy operator) in Lua - (2008-06-22)
  [1699] If you are learning Lua, here are some more examples - (2008-07-06)
  [1743] First class functions in Lua lead to powerful OO facilities - (2008-08-07)
  [1744] Lua examples, Lua Courses - (2008-08-08)
  [1847] Lua - IAQ (Infrequently Answered Questions) - (2008-10-18)
  [2312] What are closures in Lua? - (2009-07-31)
  [2347] Dot, dot, dot in Lua - variable length parameter lists - (2009-08-11)
  [2356] Passing multiple results back from a function - Lua, Python, etc - (2009-08-13)
  [2455] Lua examples - coroutines, error handling, objects, etc - (2009-10-15)
  [2723] Returning multiple values from a function - Lua - (2010-04-15)
  [2949] Lua - variable function arguments and select - (2010-09-08)
  [3695] Functions are first class variables in Lua and Python - (2012-04-13)

U105 - Lua - Tables and the table library.
  [1742] Lua - Table elements v table as a whole - (2008-08-07)
  [2346] The indexed and hashed parts of a Lua table - (2009-08-10)
  [2499] ourdog is Greyhound, Staffie and Ginger Cake - (2009-11-09)
  [2699] Lua tables - they are everything - (2010-03-30)
  [2703] Lua Metatables - (2010-04-02)
  [3694] Special __ methods you can use in Lua metatables - (2012-04-12)
  [3725] Lua Tables - (2012-05-10)
  [4248] Metatables, Metamethods, classes and objects in Lua - (2014-03-18)
  [4273] Dot or Colon separator between table name and member in Lua - what is the difference? - (2014-05-06)
  [4571] Lua - using modules to add your own utilities - (2015-11-04)


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This is a page archived from The Horse's Mouth at http://www.wellho.net/horse/ - the diary and writings of Graham Ellis. Every attempt was made to provide current information at the time the page was written, but things do move forward in our business - new software releases, price changes, new techniques. Please check back via our main site for current courses, prices, versions, etc - any mention of a price in "The Horse's Mouth" cannot be taken as an offer to supply at that price.

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