How To Calculate On-Balance Volume (OBV) in Julia?

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function obv(prices::Vector{Float64}, volumes::Vector{Float64})
    obv_values = zeros(length(prices))
    obv_values[1] = volumes[1]
    
    for i in 2:length(prices)
        if prices[i] > prices[i-1]
            obv_values[i] = obv_values[i-1] + volumes[i]
        elseif prices[i] < prices[i-1]
            obv_values[i] = obv_values[i-1] - volumes[i]
        else
            obv_values[i] = obv_values[i-1]
        end
    end
    
    return obv_values
end

# Example data
prices = [10.0, 11.0, 12.0, 11.5, 11.0]
volumes = [1000.0, 1500.0, 2000.0, 1000.0, 500.0]

obv_values = obv(prices, volumes)
println(obv_values)