arrayVsObjectMemory.js

const TOPIC_BUFFER = 'topic';
const MSG_LEN = 7;

function topic() {
  return 'topic';
  return TOPIC_BUFFER.toString();
}

const SINGLE_BUFFER = Buffer.alloc(MSG_LEN);
function msg() {
  return SINGLE_BUFFER;
  return Buffer.alloc(MSG_LEN);
}

function createArray() {
  return [topic(), msg()];
}

function createObject() {
  return {topic: topic(), msg:msg()};
}

const count = 1e6;
const result = [];

const before = process.memoryUsage();
console.log("BEFORE", before);
for (let i = 0; i< count; ++i) {
  result.push(createArray());
//  result.push(createObject());
}
const after = process.memoryUsage();
console.log("AFTER", after);

console.log("DELTA");
console.log("RSS", after.rss - before.rss);
console.log("Used heap", after.heapUsed - before.heapUsed);

console.log(result.length);