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juju.pelus

How to use table.sort & table.insert

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table.sort(table [, comp])

A comparison function can be provided to customise the element sorting. The comparison function must return a boolean value specifying whether the first argument should be before the second argument in the sequence. The default behaviour is for the < comparison to be made. For example, the following behaves the same as no function being supplied:

> t = { 3,2,5,1,4 }
> table.sort(t, function(a,b) return a<b end)
> = table.concat(t, ", ")
1, 2, 3, 4, 5        

We can see if we reverse the comparison the sequence order is reversed.

> table.sort(t, function(a,b) return a>b end)
> = table.concat(t, ", ")
5, 4, 3, 2, 1

 

table.insert(table, [pos,] value)

Insert a given value into a table. If a position is given insert the value before the element currently at that position:

 
> t = { 1,3,"four" }
> table.insert(t, 2, "two")  -- insert "two" at position before element 2
> = table.concat(t, ", ")
1, two, 3, four

 

>>>lua-users.org/wiki/TableLibraryTutorial<<<

Edited by Mr.Loki

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