Velocity Voting

vote.js

const weights = {
  fcp: 2,
  fmp: 5,
  js: 3,
  tti: 1
}

const negativeWeights = {
  fcp: 3,
  fmp: 6,
  js: 4,
  tti: 0
}

function isRequestGood(rumGrades) {
  let goodVotes = 0
  let badVotes = 0

  for (const [metricName, metricGrade] of Object.entries(rumGrades)) {
    const weight = weights[metricName]
    const negativeWeight = negativeWeights[metricName]
    
    switch (metricGrade) {
      case 'instant':
        goodVotes += weight * 2
        break;
      case 'fast':
        goodVotes += weight * 1.5
        break;
      case 'tolerantly':
        goodVotes += weight
        break;
      case 'slow':
        badVotes += negativeWeight;
        break;
      case 'terrible':
        badVotes += negativeWeight * 3;
        break;
    }
  }
  
  return goodVotes > badVotes;
}