Modulo:Sandbox/ValterVB/ISSN

local getArgs = require('Module:Arguments').getArgs
local p = {}

function p.ISSN(frame)
    local t = getArgs(frame)
	local id = t[1]
    result=tonumber(string.sub (id, 5 , 5))
    --result=8*string.sub (id, 5 , 6)+7*string.sub (id, 6 , 7)+6*string.sub (id, 7 , 8)+5*string.sub (id, 8 , 9)+4*string.sub (id, 10 , 11)+3*string.sub (id, 11 , 12)+2*string.sub (id, 12 , 13)
    --result=11-(result % 11)
    
    return result
end
 
return p