Times a function using a callback

functimer.js

// For use in Node.js
//const { performance } = require('perf_hooks')

function funcTimer(callback){
  performance.mark('A')
  var callbackReturn = callback();
  performance.mark('B')
  performance.measure('A->B', 'A', 'B')
  const measure = performance.getEntriesByName('A->B')[0]
  console.log(arguments.callee.name, 'execution took:', measure.duration, 'ms')
  return callbackReturn
}