Javascript Reduce() methodu ne işe yarar ?
reduce() için belki de anlaşılması en kolay durum, bir dizideki tüm öğelerin toplamını döndürmektir:
Neden kullanmalıyım?
- Hesaplamalar yapın
- Bir değer hesapla
- Yinelenenleri say
- Nesneleri özelliğe göre gruplandırma
- Sözleri sırayla yerine getirin
- Hesaplamaları gerçekleştirmenin hızlı bir yolu
Diyelim ki bir haftalık toplam harcamalarınızı öğrenmek istiyorsunuz. Bu değeri elde etmek için reduce() kullanın.
const array1 = [1, 2, 3, 4];
const reducer = (previousValue, currentValue) => previousValue + currentValue;
// 1 + 2 + 3 + 4
console.log(array1.reduce(reducer));
// expected output: 10
// 5 + 1 + 2 + 3 + 4
console.log(array1.reduce(reducer, 5));
// expected output: 15
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