ipairs and pairs

[mjau]

Can someone tell me whats the diffference with pairs and ipairs and which can be used where ?

[Jaysds1]

For now, I know pairs start at the beginning of the table and ipairs start at 1.

[mjau]

isnt it more than than that ?

[Jaysds1]

isnt it more than than that ?

I'm not sure, I'm reading this page now: http://lua-users.org/wiki/GeneralizedPairsAndIpairs

EDIT: Pairs: http://www.lua.org/manual/5.1/manual.html#pdf-pairs

Ipairs: http://www.lua.org/manual/5.1/manual.html#pdf-ipairs

[arezu]

use ipairs when you have an indexed table like this:

local ourTable = {} 
ourTable[1] = 3 
ourTable[2] = "helloworld" 
ourTable[3] = "another" 

and pairs when your table looks like this:

local ourTable = {} 
ourTable["helloworld"] = "this is an example" 
ourTable[2] = 3.14 
ourTable[localPlayer] = 22 

you can use pairs on the first example too, but its not sure if it will start on ourTable[1] and end on ourTable[3].

[Kenix]

Can someone tell me whats the diffference with pairs and ipairs and which can be used where ?

ipairs loop only number indexes ( start from 1 index ) and only in order.

pairs loop all.

Examples (ipairs)

  
-- Example 1 
for n, s in ipairs{ 'new', 'next' } do -- { [1] = 'new', [2] = 'next' } is some 
    print( n, s ) 
end 
  
--[[ 
1 new 
2 next 
]] 
  
-- Example 2  
for n, s in ipairs{ [1] = 'new', [3] = 'next' } do 
    print( n, s ) 
end 
  
--[[ 
1 new 
]] 
  
-- Example 3 
for n, s in ipairs{ [0] = 'new', [1] = 'next' } do 
    print( n, s ) 
end 
  
--[[ 
1 new 
]]