multiple-ema.js

mutliple-ema.js

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

// let's create our own method
var method = {};

// prepare everything our method needs
method.init = function() {
  this.name = 'multiple-emas';

  // step 1: register all the EMAs you want:

  // all the short EMAs
  this.addIndicator('shortEma1', 'EMA', 1);
  this.addIndicator('shortEma2', 'EMA', 2);
  this.addIndicator('shortEma3', 'EMA', 3);
  this.addIndicator('shortEma4', 'EMA', 4);
  this.addIndicator('shortEma5', 'EMA', 5);
  this.addIndicator('shortEma6', 'EMA', 6);

  // all the long EMAs
  this.addIndicator('longEma1', 'EMA', 20);
  this.addIndicator('longEma2', 'EMA', 21);
  this.addIndicator('longEma3', 'EMA', 22);
  this.addIndicator('longEma4', 'EMA', 23);
  this.addIndicator('longEma5', 'EMA', 24);
  this.addIndicator('longEma6', 'EMA', 25);  
}

method.check = function(candle) {

  // step 2: check all the results

  var shortEmas = [
    this.indicators.shortEma1.result,
    this.indicators.shortEma2.result,
    this.indicators.shortEma3.result,
    this.indicators.shortEma4.result,
    this.indicators.shortEma5.result,
    this.indicators.shortEma6.result
  ];
  var longEmas = [
    this.indicators.longEma1.result,
    this.indicators.longEma2.result,
    this.indicators.longEma3.result,
    this.indicators.longEma4.result,
    this.indicators.longEma5.result,
    this.indicators.longEma6.result
  ];

  // console.log('shortEmas:', shortEmas);
  // console.log('longEmas:', longEmas);

  var lowestShortEma = _.min(shortEmas);
  var highestLongEma = _.max(longEmas);

  if(lowestShortEma > highestLongEma) {
    this.advice('long');
  }

  var highestShortEma = _.max(shortEmas);
  var lowestLongEma = _.min(longEmas);

  if(highestShortEma < lowestLongEma) {
    this.advice('short');
  }
  
}

module.exports = method;

Im trying to do this with three talib EMA's

I get "TypeError: Cannot read property 'long2Size' of undefined"

this.addTalibIndicator('longEMA2', 'ema', {optInTimePeriod : this.settings.long2Size});

Thoughts?