CODEWITHSUNDEEP
lua
Manlaibayar Amgalanbaatar
Manlaibayar Amgalanbaatar

Reputation: 77

How to remove duplicate from table Lua

How to remove duplicate ids from table?

local xx={{id=1,name=user1},{id=1,name=user1},{id=1,name=user1},{id=3,name=user3},{id=2,name=user2}} 
    
    local result = {}
    
    for key,value in ipairs(xx) do
      if value.id ~=xx[key+1] then
        table.insert(result,value)
      end
    end
    
    for key,value in ipairs(result) do
      print(key,value.id)   
    end

I want to print like this 1,3,2.

Upvotes: 0

Views: 409

Answers (1)

Nifim
Nifim

Reputation: 5031

you can take the value name and use it as a key, to create a duplicate free unordered table.

local t={{id=1,name='a'},{id=1,name='a'},{id=1,name='a'},{id=3,name='c'},{id=2,name='b'}} 
local users = {}

for k, v in ipairs(t) do
  users[v.name] = v.id
end

for k, v in pairs(users) do
  print(k,v)
end

Output

b   2
a   1
c   3

Upvotes: 1

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