[比較 Array 和 Generator 的作法]

rangeGenerator.js

// 搭配 Quokka.js 來測試會比較方便看

function* rangeGenerator(start, end) {
    for (let i = start; i < end; i++) yield i;
}

function range(start, end) {
    return Array.from({ length: end - start }, (_, i) => i + start);
}

let MAX = 1_000_000;

console.time('generator');
console.log([...rangeGenerator(1, MAX)].length);
console.timeEnd('generator');

console.time('array');
console.log(range(1, MAX).length);
console.timeEnd('array');


// generator: 227.949ms
// array: 371.532ms