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                * [11.1](https://github.com/yuche/javascript#11.1)?不要使用 iterators。使用高階函數例如?`map()`?和?`reduce()`?替代?`for-of`。 > 為什么?這加強了我們不變的規則。處理純函數的回調值更易讀,這比它帶來的副作用更重要。 ~~~ const numbers = [1, 2, 3, 4, 5]; // bad let sum = 0; for (let num of numbers) { sum += num; } sum === 15; // good let sum = 0; numbers.forEach((num) => sum += num); sum === 15; // best (use the functional force) const sum = numbers.reduce((total, num) => total + num, 0); sum === 15; ~~~ * [11.2](https://github.com/yuche/javascript#11.2)?現在還不要使用 generators。 > 為什么?因為它們現在還沒法很好地編譯到 ES5。
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