如何在JavaScript中以數組形式返回對象的特定屬性

Question

我有一個函數，該函數需要一個狗對象數組並返回特定屬性的數組

The code that I have tried
function Owner(dogs) {
     dogs.map(value => {
     if (value.breed === 'GermanShepherd') {
         return value.owner;    
 }
}

Answer 1

一種選擇是使用reduce()並檢查品種是否與search變量相同（如果相同reduce() ，請使用concat()添加到累加器中。

 let arr = [{"name":"Beatrice","breed":"Lurcher","owner":"Tom"},{"name":"Max","breed":"GermanShepherd","owner":"Malcolm"},{"name":"Poppy","breed":"GermanShepherd","owner":"Vikram"}]; let search = 'GermanShepherd'; let result = arr.reduce((c, v) => v.breed === search ? c.concat(v.owner) : c, []); console.log(result); 

---

您還可以使用filter和map組合。

 let arr = [{"name":"Beatrice","breed":"Lurcher","owner":"Tom"},{"name":"Max","breed":"GermanShepherd","owner":"Malcolm"},{"name":"Poppy","breed":"GermanShepherd","owner":"Vikram"}] let search = 'GermanShepherd'; let result = arr.filter(o => o.breed === search).map(o => o.owner); console.log(result);