Module:Sandbox/Greenbreen/Toy

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local p = {}

-- Core worker (logic only)
function p._compute(args)
    -- raw input dump
    if args.debug == "dump" then
        return "<pre>" .. mw.dumpObject(args) .. "</pre>"
    end

    -- argument checking
    if not args.x then
        error("Missing required parameter |x=")
    end

    local x = tonumber(args.x)
    if not x then
        error("Parameter |x= must be numeric, got: " .. args.x)
    end

    local y = x * 2

    -- optional debug output
    if args.debug == "value" then
        return "DEBUG: x=" .. x .. ", y=" .. y
    end

    return "Result: " .. y
end

-- Template entry point
function p.main(frame)
    return p._compute(frame.args)
end

return p