Trying to access table in class

Questions
1

I’m trying on adding data to a table that I have within a class. No matter what I try, the table is nil.


TestClass = class()

function TestClass:init(x)
     self.x = x
     self.numbers={}
end

function TestClass:insertNumber(number)
    table.insert(self.numbers,number)
end

--Main
function setup()
    tests={}

    table.insert(tests,TestClass)
    table.insert(tests,TestClass)

    tests[1]:insertNumber(5)
end

I get the error on the first table.insert

Mike

2

@mikeyleo Here’s how to do it.

--Main
function setup()
    a=TestClass(12345)
    b=TestClass(324)
    
    a:insertNumber(25)
    a:insertNumber(32)
    a:insertNumber(12)
    
    b:insertNumber(65)
    b:insertNumber(72)
    b:insertNumber(28)
    
    a:print("a")
    b:print("b")    
end


TestClass = class()

function TestClass:init(x)
     self.x = x
     self.numbers={}
end

function TestClass:insertNumber(number)
    table.insert(self.numbers,number)
end

function TestClass:print(val)
    print("Class instance  "..val)
    print("value of x "..self.x)
    print("table values")
    for a,b in pairs(self.numbers) do
        print(b)
    end
end
3

@mikeyleo Your mistake was saying:

table.insert(tests,TestClass)

in the setup. The class function is setup so that when you use parentheses, then it calls the init function. Therefore, you have to insert a TestClass(), which instantiates a new TestClass that will have it’s own number table. So,

table.insert(tests,TestClass())
4

The parentheses did the trick. Thanks to both of you!