[Help] Loop pairs and tables

[victormgons]

Hi, i have this script that isn't working correctly.

testTable = {
["1"] = {},
["2"] = {},
["3"] = {},
["4"] = {},
["5"] = {},
["6"] = {},
["7"] = {},
["8"] = {},
["9"] = {},
["10"] = {},
}

for catName,category in pairs(testTable)do
  outputChatBox(catName)
end

It doesn't show the numbers in order, it shows: 1 3 2 5 4 7 6 9 8 10.

What's wrong? Is there a way to fix it? Thanks

[Captain Cody]

Use ipairs instead of pairs.

[Walid]

* ipairs: loop only number indexes "start from 1 index" and only in order.

* pairs: Loop all.

[victormgons]

I tried to use ipairs but it didn't show nothing

[Captain Cody]

Oh whoops I'm sorry I did not read that correctly, remove the "" around the numbers, instead of "1" use 1.

 

    testTable = {
    [1] = {},
    [2] = {},
    [3] = {},
    [4] = {},
    [5] = {},
    [6] = {},
    [7] = {},
    [8] = {},
    [9] = {},
    [10] = {},
    }

    for catName,category in pairs(testTable)do
      outputChatBox(catName)
    end

 

[Simple0x47]

This is the way to do it.

testTable = {
 {},
 {},
 {},
 {},
 {},
 {},
 {},
 {},
 {},
 {},
}

for i = 1, #testTable do
  local catName = i
  local category = testTable[ i ]
  outputChatBox(catName)
end

 

[Gravestone]

table.sort

 

[Simple0x47]

The one that I used does that automatically with no-need of using table.sort . Numeric for life :v

[victormgons]

But i'm using strings, i posted with numbers for a example

[victormgons]

I'm using the table like this

testTable = {
["Primary Weapon"] = {},
["Secondary Weapon"] = {},
["Pistols"] = {},
["Specially Weapon"] = {},
["Ammo"] = {},
["Food"] = {},
["Medic Stuff"] = {},
["Vehicle Parts"] = {},
["Items"] = {},
["Toolbelt"] = {},
}

for catName,category in pairs(testTable)do
  outputChatBox(catName)
end

And it needs to start on Primary Weapon and finish on Toolbelt, in order..

[Captain Cody]

Here

    testTable = {
    {"Primary Weapon"},
    {"Secondary Weapon"},
    {"Pistols"},
	{"Specially Weapon"},
    {"Ammo"},
    {"Food"},
    {"Medic Stuff"},
    {"Vehicle Parts"},
    {"Items"},
    {"Toolbelt"},
    }

    for i = 1, #testTable do
      outputChatBox(testTable[i][1])
    end

 

Edited October 29, 2016 by CodyL

[KariiiM]

Victor, can I know why you creating empty tables inside a table ? what's the purpose of that 

[Walid]

i don't know what you want exactly, maybe you need sth like this

local testTable = {
       ["Primary Weapon"] = 1,
       ["Secondary Weapon"] = 2,
       ["Pistols"] = 3,
       ["Specially Weapon"] = 4,
       ["Ammo"] = 5,
       ["Food"] = 6,
       ["Medic Stuff"] = 7,
       ["Vehicle Parts"] = 8,
       ["Items"] = 9,
       ["Toolbelt"] = 10,
}

function switch(theTable)
   local order = {}
   for k,v in pairs(theTable) do
      order[v] = k
   end
   return order
end

local newTable = switch(testTable)
for i=1 ,#newTable do
   outputChatBox(i..": "..newTable[i])
end

 

[victormgons]

1 hour ago, KariiiM said:

Victor, can I know why you creating empty tables inside a table ? what's the purpose of that 

 

This is a part of an inventory, the names are tha categories and inside them will have items

Edited October 29, 2016 by victormgons
Quote

[KariiiM]

Victor, you can't do it with your case.

@Gravestone, table.sort won't do what he wants to achieve, because this function will only do an alphabetical order.

you can use Walid's way its good enough to do what you are looking for

Edited October 29, 2016 by KariiiM

[GTX]

Lua does not retain the order that key, value pairs are added.

However, this can be emulated.

function orderedTable(...)
  local newTable,keys,values={},{},{}
  newTable.pairs=function(self)
    local count=0
    return function() 
      count=count+1
      return keys[count],values[keys[count]]
    end
  end
  setmetatable(newTable,{
    __newindex=function(self,key,value)
      if not self[key] then table.insert(keys,key)
      elseif value==nil then
        local count=1
        while keys[count]~=key do count = count + 1 end
        table.remove(keys,count)
      end
      values[key]=value
    end,
    __index=function(self,key) return values[key] end
  })
  for x=1,table.getn(arg) do
    for k,v in pairs(arg[x]) do newTable[k]=v end
  end
  return newTable
end

Example usage:

test = orderedTable({value="key"},{anotherValue="anotherKey"})

test["apple"] = "red"
test["mta"] = "sa"

for k,v in test:pairs() do
  outputChatBox(k.."    "..v)
end

The output is ordered; something like:

Quote

value    key

anotherValue    anotherKey

apple    red

mta    sa

Not tested

Edited October 29, 2016 by GTX

[GTX]

Double post because can't edit heh...

Anyways, here's updated code:

function orderedTable(...)
    local newTable,keys,values={},{},{}
    newTable.pairs=function(self)
        local count=0
        return function()
            count=count+1
            return keys[count],values[keys[count]]
        end
    end
    setmetatable(newTable,{
        __newindex=function(self,key,value)
            if not self[key] then
                table.insert(keys,key)
            elseif value==nil then
                local count=1
                while keys[count]~=key do
                  count = count+1
                end
                table.remove(keys,count)
            end
            values[key] = value
        end,
        __index=function(self,key)
          return values[key]
        end
    })
    return newTable
end

testTable = orderedTable()

testTable["Primary Weapon"] = {}
testTable["Secondary Weapon"] = {}
testTable["Pistols"] = {}
testTable["Specially Weapon"] = {}
testTable["Ammo"] = {}
testTable["Food"] = {}
testTable["Medic Stuff"] = {}
testTable["Vehicle Parts"] = {}
testTable["Items"] = {}
testTable["Toolbelt"] = {}

for catName,category in testTable:pairs() do
    outputChatBox(catName)
end

It works, I tested it. When you add something to a table, __newindex is invoked and the value you passed is added to a indexed table. You can later fetch it. It also has when you set a key to nil, it will be removed from table, so if you'd like to remove Pistols key, all you need to do is: testTable["Pistols"] = nil.

[victormgons]

On 29/10/2016 at 11:17 PM, GTX said:

Double post because can't edit heh...

Anyways, here's updated code:

function orderedTable(...)
    local newTable,keys,values={},{},{}
    newTable.pairs=function(self)
        local count=0
        return function()
            count=count+1
            return keys[count],values[keys[count]]
        end
    end
    setmetatable(newTable,{
        __newindex=function(self,key,value)
            if not self[key] then
                table.insert(keys,key)
            elseif value==nil then
                local count=1
                while keys[count]~=key do
                  count = count+1
                end
                table.remove(keys,count)
            end
            values[key] = value
        end,
        __index=function(self,key)
          return values[key]
        end
    })
    return newTable
end

testTable = orderedTable()

testTable["Primary Weapon"] = {}
testTable["Secondary Weapon"] = {}
testTable["Pistols"] = {}
testTable["Specially Weapon"] = {}
testTable["Ammo"] = {}
testTable["Food"] = {}
testTable["Medic Stuff"] = {}
testTable["Vehicle Parts"] = {}
testTable["Items"] = {}
testTable["Toolbelt"] = {}

for catName,category in testTable:pairs() do
    outputChatBox(catName)
end

It works, I tested it. When you add something to a table, __newindex is invoked and the value you passed is added to a indexed table. You can later fetch it. It also has when you set a key to nil, it will be removed from table, so if you'd like to remove Pistols key, all you need to do is: testTable["Pistols"] = nil.

It worked, thanks a lot