inspect

-- returns true if the block in this directions is in the given array
local function Forward(arr)
    local bBlockForward, data = turtle.inspect()
    local blockname = data.name
    if bBlockForward then
        for i = 1, #arr, 1 do
            if blockname == arr[i] then
                if blockname == "minecraft:lava" then
                    local level = data.state.level
                    if not (level == 0) then
                        return false
                    end
                end
                return true
            end
        end
    end
    return false
end

local function Up(arr)
    local bBlockUp, data = turtle.inspectUp()
    local blockname = data.name
    if bBlockUp then
        for i = 1, #arr, 1 do
            if blockname == arr[i] then
                if blockname == "minecraft:lava" then
                    local level = data.state.level
                    if not (level == 0) then
                        return false
                    end
                end
                return true
            end
        end
    end
    return false
end

local function Down(arr)
    local bBlockDown, data = turtle.inspectDown()
    local blockname = data.name
    if bBlockDown then
        for i = 1, #arr, 1 do
            if blockname == arr[i] then
                if blockname == "minecraft:lava" then
                    local level = data.state.level
                    if not (level == 0) then
                        return false
                    end
                end
                return true
            end
        end
    end
    return false
end

return { Forward = Forward, Up = Up, Down = Down}