copmareRuntime.js

function copmareRuntime(functionSet= {}, params=[], iterations=10000, averageOf = 1){
  
  const report = {};
  report.results = [];
  let slowestTime = 0;
  let fastestTime = 0;
  let slowestTotalTime = 0;
  let fastestTotalTime = 0;
  let fastestFunction = '';
  let slowestFunction = '';
  
  
  for (let key in functionSet ){
    const result = {};
    result.function = key;
    const func = functionSet[key];
    
    let totalTimeTaken = 0;
    
    for(let i = 1; i <= averageOf; i++){
      
      // Get a hold of start
      let t1 = Date.now();

      // call the function for iteration
      for (let i = 0 ; i <=iterations; i++){
        func(...params);
      }

      const t2 = Date.now() - t1;  
      totalTimeTaken += t2;
    }
    
    const timeTaken = Math.round(totalTimeTaken / averageOf);
    
    if( !fastestTime || timeTaken < fastestTime){
      fastestTime = timeTaken;
      fastestFunction = key;
    } 
  
    if( !slowestTime || timeTaken > slowestTime){
      slowestTime = timeTaken;
      slowestFunction = key;
    }
    
    if( !fastestTotalTime || totalTimeTaken < fastestTotalTime){
      fastestTotalTime = totalTimeTaken;
    } 
    if( !slowestTotalTime || totalTimeTaken > slowestTotalTime){
      slowestTotalTime = totalTimeTaken;
    }     
    
    
    result.averageTime = timeTaken;
    result.totalTime = totalTimeTaken;
    report.results.push(result);
    
  }
  
  let fastestBy= (slowestTotalTime - fastestTotalTime) / fastestTotalTime;
  fastestBy = !isNaN(fastestBy) ? fastestBy : 0;
  
  report.fastest = fastestFunction;
  report.slowest = slowestFunction;
  report.leadTimeAverage = slowestTime - fastestTime;
  report.leadTimeTotal = slowestTotalTime - fastestTotalTime;
  report.fasterBy = `${Math.round(fastestBy * 100)}%`;
  report.iterations = iterations;
  report.averageOf = averageOf;
  
  console.log(report);
  return report;
}

module.exports = copmareRuntime;