Benchmark random access of an object, with keys created as random hash strings

benchmark_object_random_access.js

const md5 = require('md5');

const size = parseInt(process.argv[2], 10);

if (!size) {
  throw new Error('Must provide size of object as first argument.');
}

console.log(`Initializing object of size ${size}...`);

const obj = {};

for (let i = 0; i < size; i += 1) {
  obj[md5(i)] = i;
}

console.log('Completed initialization.');
console.log('Running benchmark...');

const key = md5(Math.floor(Math.random() * size));

const startTime = Date.now();

const value = obj[key];

console.log(`Completed benchmark, found ${value} at ${key} in ${Date.now() - startTime}ms.`);