Return strings from table values Lua

Question

I am trying to learn how to print strings from a value in a table. For example.

TestTable = { "Apples" = 0, "Oranges" = 1, "Grapes" = 1, "Bananas" = 0}

for i=1, #TestTable do
   if TestTable[i] == 1 then
      print(TestTable[i]) --> Oranges Grapes
   end
end

Not sure if that made sense, but I want to print all the strings with the 1 value.

BTW, your table constructor is incorrect, change "Apples" = 0 to either Apples = 0 or ["Apples"] = 0. — Yu Hao
– Yu Hao, Commented Feb 6, 2015 at 7:14

Yu Hao · Accepted Answer · 2015-02-06 07:11:14Z

2

Unless the __len metamethod is defined, the # operator can only be used on a sequence, but TestTable is not one.

You can use pairs to iterate the table:

TestTable = { Apples = 0, Oranges = 1, Grapes = 1, Bananas = 0}

for k, v in pairs(TestTable) do
    if v == 1 then
        print(k)
    end
end

answered Feb 6, 2015 at 7:11

Yu Hao

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2 Comments

Benjamin Condrea Over a year ago

It works. I am curious why "apples", "oranges", etc don't need quotes?

Yu Hao Over a year ago

@BenjaminCondrea It's syntactic sugar. See PiL.

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