Hash Map Perf.

test.js

const hash = {
  a: 1,
  b: 1,
  c: 1,
  d: 1,
  e: 1,
  g: 1,
  h: 1,
  j: 1,
  k: 1,
  l: 1,
  m: 1,
  n: 1,
  o: 1,
  p: 1,
  q: 1,
  r: 1,
  s: 1,
  t: 1,
  u: 1,
  v: 1,
  w: 1,
  x: 1,
  y: 1,
  z: 1,
  a1: 1,
  b1: 1,
  c1: 1,
  d1: 1,
  e1: 1,
  g1: 1,
  h1: 1,
  j1: 1,
  k1: 1,
  l1: 1,
  m1: 1,
  n1: 1,
  o1: 1,
  p1: 1,
  q1: 1,
  r1: 1,
  s1: 1,
  t1: 1,
  u1: 1,
  v1: 1,
  w1: 1,
  x1: 1,
  y1: 1,
  z1: 1,
};

const time = () => Number(new Date());
// Four Hundred Billion Iterations
const iterations = 400000000000;

const start2 = time();
let count2 = 0;
for (let i = 0; i < iterations; i += 1) {
  count2 += hash.z1;
}
console.log("z1", count2 === iterations);
const elapsed2 = time() - start2;
console.log("z1", elapsed2);

const start = time();
let count = 0;
for (let i = 0; i < iterations; i += 1) {
  count += hash.a;
}
console.log("a", count === iterations);
const elapsed = time() - start;
console.log("a", elapsed);

// "A" always wins... just.

// ❯ node hashspeed.js
// z1 true
// z1 356436
// a true
// a 355654