How do you pass a parameter to a function in a module.

Solar2D General Questions/Discussion
#1

Starting with the following in my scene

                            print(“going in”)----> going in

                            print(pwValue[3].value) ----> 2014

                            

                            if util.leapyear(pwValue[3].value) 

in utility module

function M:leapyear(year)

    print(“you are in”)----> you are in

    print("year is "…year)

    local yr = tonumber(year)

    print(tostring(yr%4))

    print(tostring(yr))

    local leap = “No”

    if(yr%4)  == 0 and (yr%100~=0 or yr%400==0)  then

        leap = “Yes”

    end

        print(leap)

    return leap

    

end

results in 

going in

2014

you are in

Runtime error

/Users/rvergin/Library/Application Support/Outlaw/Sandbox/11/utilityfunctions.lua:237: attempt to concatenate local ‘year’ (a nil value)

Why is it nil? 

#2

even adding tostring

    print("year is "… tostring(year))

I get 

year is nil

#3

Can you provide more code? Specifically the pwValue[n].value. 

#4

                local pwValue = pickerwheel1:getValues()

provides the values and index 3 is the year as you can see in the print statements and the log.

#5

have you already tried simplifying it to the point where you are explicitly declaring the passed variable? Something like this:

local yearVal = 2014 util.leapyear(yearVal)
#6

same error yearval is nil.

I have set up a global variable and set its’ value without passing it and the math works.

#7

even adding tostring

    print("year is "… tostring(year))

I get 

year is nil

#8

Can you provide more code? Specifically the pwValue[n].value. 

#9

                local pwValue = pickerwheel1:getValues()

provides the values and index 3 is the year as you can see in the print statements and the log.

#10

have you already tried simplifying it to the point where you are explicitly declaring the passed variable? Something like this:

local yearVal = 2014 util.leapyear(yearVal)
#11

same error yearval is nil.

I have set up a global variable and set its’ value without passing it and the math works.