OkCoin CandleSticks three black crows

publicClient.getKline (function(error, data) {
    clandesticksData = data;
}, 'btc_cny', '5min', 3);

// candlestick negativas
function negativeCandle(candle){
    return parseFloat(candle[1]) > parseFloat(candle[4]);
}

// candlestick positivas
function positiveCandle(candle) {
    return !negativeCandle(candle);
}

// candlesticks do tipo three black crows
function blackCrows(lastcandle1, lastcandle2, lastcandle3) {

    if( !negativeCandle(lastcandle1) )
        return false;
    if( !negativeCandle(lastcandle2) )
        return false;
    if( !negativeCandle(lastcandle3) )
        return false;

    return true;
}