JS : .filter Method

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1. const randomNumbers = [375, 200, 3.14, 7, 13, 852];
   
2. 
   
3. // Call .filter() on randomNumbers below
   
4. const smallNumbers = randomNumbers.filter(randomNumber => {
   
5.   return randomNumber < 250;
   
6. });
   
7. 
   
8. const favoriteWords = ['nostalgia', 'hyperbole', 'fervent', 'esoteric', 'serene'];
   
9. 
   
10. // Call .filter() on favoriteWords below
    
11. const longFavoriteWords = favoriteWords.filter(favoriteWord => {
    
12.   return favoriteWord.length > 7;
    
13. });

複製代碼

.filter 和 .map Method 很像。Like .map(), .filter() returns a new array.