Check speed reading process.env

check_enc_cache.js

const random = Math.random();
let res = 0;
let TT = '2';
let TT2 = '3';

// To avoid JIT optimization for varible 'let TT'
let timer = setTimeout(() => {
  TT = String(Math.random());
  TT2 = String(Math.random());
}, 1000);

console.time('With env');
for (let i = 0;i < 20000; i++) {
  if (process.env.TT !== '1' && process.env.TT2 !== '10') {
    res += random;
  }
};
console.timeEnd('With env');

console.time('With cache env');
for (let i = 0;i < 20000; i++) {
  if (TT !== '1' && TT2 !== '10') {
    res += random;
  }
};
console.timeEnd('With cache env');

// Show result to avoid JIT optimization for calculation res
console.log(res);
clearTimeout(timer);