text: // required indicators
  
  var Indicator = function(weight) {
    this.weight = weight;
    this.prices = [];
    this.result = 0;
    this.age = 0;
  }
  
  Indicator.prototype.update = function(price) {
    this.prices[this.age % this.weight] = price;
    sum = this.prices.reduce(function(a, b) { return a + b; }, 0);
    this.result = sum / this.prices.length;
    this.age++;
  }
  
  module.exports = Indicator;
  