[BOUNTY COMPLETD] fix DEMA example strategy

Code:
/*

    TEMA

    Triple EMA strategy with 'safety net'

    ---

    Uses two TEMA's to go long/short and a long SMA

    in order to completely stay out of market if the

    long trend is really terrible.

    ---

    The general idea is to lower the risk.

*/



// req's

var _ = require ('lodash');

var log = require ('../core/log.js');



// conf

var config = require ('../core/util.js').getConfig();

var async = require ('async');



// create method

var method = {};





// init

method.init = function()

{



    this.name = 'Triple TEMA';



    // state, current trend

    this.trend = {

        direction: 'none',

        duration: 0,

        persisted: false,

        adviced: false

    };

    

    this.useSafety = false;



    // yes

    this.requiredHistory = config.tradingAdvisor.historySize;

    

    // add params    

    this.addTulipIndicator('maSlow', 'tema', { optInTimePeriod: this.settings.TEMA_long });

    this.addTulipIndicator('maFast', 'tema', { optInTimePeriod: this.settings.TEMA_short });

    

    if( this.settings.SMA_long > 0 )

    {

        this.useSafety = true;

        this.addTulipIndicator('maSlowest', 'sma', { optInTimePeriod: this.settings.SMA_long });

    }

   

}



// what happens on every new candle?

method.update = function(candle) {} // nothing

method.log = function() {} // nothing



method.check = function (candle)

{

    if (candle.close.length < this.requiredHistory) { return; } // still needed?

    

    // fetch indicators

    let ti = this.tulipIndicators;

    let maFast = ti.maFast.result.result,

        maSlow = ti.maSlow.result.result,

        maSlowest = false,

        useSafety = this.useSafety;

        

    if( useSafety ) maSlowest = ti.maSlowest.result.result;

        

    

    // rules

    let goLong, goShort;

    

    goLong = maFast > maSlow ? true : false;

    goShort = maFast < maSlow ? true : false;

    

    // safety

    if( useSafety ) {

        goLong = maFast > maSlow && maSlow > maSlowest; // slow must be over the really slow trend

    }

    

    

    // LONG

    if( goLong )

    {

        // new trend? (only act on new trends)

        if (this.trend.direction !== 'up')

        {

            log.debug ('In positive trend since', this.trend.duration, 'candle (s)');

            

            // reset the state for the new trend

            this.trend = {

                duration: 0,

                persisted: false,

                direction: 'up',

                adviced: false

            };



            this.trend.duration ++;

            

            if( !this.trend.adviced )

            {

                this.trend.adviced = true;

                this.advice('long');

            }

            else

            {

                this.advice();

            }

        } // !== 'up'    

    }

    

    // SHORT

    else if( goShort )

    {

        // new trend?

        if( this.trend.direction !== 'down' ){

            

            log.debug ('In downtrend since', this.trend.duration, 'candle (s)');

            

            // reset state

            this.trend = {

                duration: 0,

                persisted: false,

                direction: 'down',

                adviced: false

            };



            this.trend.duration ++;



            if( !this.trend.adviced )

            {

                this.trend.adviced = true;

                this.advice ('short');

            }

            else

            {

                this.advice();

            }

        

        }

    }

    else

    {

        log.debug('In no trend');

        this.advice();

    }

    

} // method.check()



module.exports = method;