// Simple moving average.
export class SimpleMovingAverage {

  constructor(sampleCount = 10) {
    this.sampleCount = sampleCount;
    this.samples = [];
    this.value = 0;
  }

  sample(datum) {
    this.samples.push(datum);
    if (this.samples.length > this.sampleCount) {
      this.samples.splice(0, 1);
    }
    let sum = 0;
    for (let i = 0; i < this.samples.length; i++) {
      sum += this.samples[i];
    }
    const length = this.samples.length < this.sampleCount ?
      this.samples.length
    :
      this.sampleCount;
    this.value = sum / length;
  }

}