laphilosophia

  fpsMeter() {
    let prevTime = Date.now(),
        frames = 0;

    requestAnimationFrame(function loop() {
      const time = Date.now();
      frames++;
      if (time > prevTime + 1000) {
        let fps = Math.round( ( frames * 1000 ) / ( time - prevTime ) );
        prevTime = time;

laphilosophia

function promiseMap(inputValues, mapper) {
  const reducer = (acc$, inputValue) =>
    acc$.then(acc => mapper(inputValue).then(result => acc.push(result) && acc));
  return inputValues.reduce(reducer, Promise.resolve([]));
}

/* Example */

const axios = require('axios');

laphilosophia

/**
 Compares two items (values or references) for nested equivalency, meaning that
 at root and at each key or index they are equivalent as follows:

 - If a value type, values are either hard equal (===) or are both NaN
     (different than JS where NaN !== NaN)
 - If functions, they are the same function instance or have the same value
     when converted to string via `toString()`
 - If Date objects, both have the same getTime() or are both NaN (invalid)
 - If arrays, both are same length, and all contained values areEquivalent