JS : .filter Method
const randomNumbers = ;// Call .filter() on randomNumbers below
const smallNumbers = randomNumbers.filter(randomNumber => {
return randomNumber < 250;
});
const favoriteWords = ['nostalgia', 'hyperbole', 'fervent', 'esoteric', 'serene'];
// Call .filter() on favoriteWords below
const longFavoriteWords = favoriteWords.filter(favoriteWord => {
return favoriteWord.length > 7;
});.filter 和 .map Method 很像。Like .map(), .filter() returns a new array.
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