Custom Fib

CustomFib.js

let fibo = parseInt(process.env.FIBO);

console.time(`Fib-${fibo}`);
let counter = 1;

var l = 0;
var r = 1;

const fib = () => {
  const left = l;
  const right = r;

  let temp = r;
  r = left + right;
  l = temp;
  return counter++ === fibo ? temp : fib();
};
console.log(fib());
// const used = process.memoryUsage().heapUsed / 1024 / 1024;
// console.log(`The script uses approximately ${Math.round(used * 100) / 100} MB`);
const used = process.memoryUsage();
for (let key in used) {
  console.log(`${key} ${Math.round((used[key] / 1024 / 1024) * 100) / 100} MB`);
}
console.timeEnd(`Fib-${fibo}`);