const parts = ["alpha", "beta", "gamma"];
let x = "a string";
for (i = 0; i < 1_000_000; i++) {
x += parts[i % 3];
}
console.log(x)
const parts = ["alpha", "beta", "gamma"];
const x = ["a string"];
for (i = 0; i < 1_000_000; i++) {
x.push(parts[i % 3]);
}
x.join("");
console.log(x) const parts = ["alpha", "beta", "gamma"];
let x = "a string";
for (i = 0; i < 1_000_000; i++) {
x = `${x}${parts[i % 3]}`;
}
console.log(x)