Media Móvel OkCoin Moving Average

const SMA = require('technicalindicators').SMA;


function movingAverage() {
    var toBuy = false;

    publicClient.getKline (function(error, data) {

        if(error)
            return false;

        var prices = [];

        var ema = [];
        var ama = [];

        data.forEach(function(val){
            prices.push(val[1]);
        })

        var sma = new SMA({period : 7, values : prices});
        var sme = new SMA({period : 30, values : prices});

        prices.forEach(function(val){

            var csma = sma.nextValue(val);
            var csme = sme.nextValue(val);

            if(  csme < csma && toBuy == false) {
                toBuy = true;
            }

            if(toBuy == true && csme > csma  ) {
                toBuy = false;
            }

        })
    }, 'btc_cny', '3min', 2000);

    return toBuy;
}