const a = [];
let obj = {};
let map = new Map();
let b;
function init() {
for (let i = 0; i < 99999999; i++) {
a.push(i);
}
}
function test(title, callback) {
let t = (new Date()).getTime();
callback();
console.log(title + ' ->', ((new Date()).getTime() - t) + ' ms');
}
// init();
test('let', () => {
let i = 10;
})
test('const', () => {
const i = 10;
})