let ids = [];
for (let i = 0; i<1e6; i++){
ids.push(i)
}
ids.map(id => {
const i = id * id
});
let ids = [];
for (let i = 0; i<1e6; i++){
ids.push(i)
}
ids.forEach(id => {
const i = id * id
});
let ids = [];
for (let i = 0; i<1e6; i++){
ids.push(i)
}
for (let id of ids) {
const i = id * id
}