Javascript Date get elapsed time

Introduction

The following examples show how to determine the elapsed time between two JavaScript dates in milliseconds. 

// To test a function and get back its return
function printElapsedTime(fTest) {
  let nStartTime = Date.now(),
      vReturn = fTest(),/*from   ww w .j a v  a2  s  .c  om*/
      nEndTime = Date.now()

  console.log(`Elapsed time: ${ String(nEndTime - nStartTime) } milliseconds`)
  return vReturn
}

function my(){
    for (let i = 0; i < 10000; i++) {
        for (let i = 0; i < 10000; i++) {
           let doSomething = i * i * i;
        }
    }
    return 123;
}

let yourFunctionReturn = printElapsedTime(my);
console.log(yourFunctionReturn);



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