const ifs = i => {
if (i === 1) return '2'
// (a lot more ifs)
}

const switches = i => {
switch (i) {
case 1: return '2'
// (a lot more cases)
}
}

console.time('time')
for (let i = 0; i < 1_000_000_000; i++) ifs(i)
console.timeEnd('time')
// time: 637ms

console.time('time')
for (let i = 0; i < 1_000_000_000; i++) switches(i)
console.timeEnd('time')
// time: 949.524ms