如何在JavaScript中以数组形式返回对象的特定属性

Question

我有一个函数，该函数需要一个狗对象数组并返回特定属性的数组

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

Answer 1

一种选择是使用reduce()并检查品种是否与search变量相同（如果相同reduce() ，请使用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); 

---

您还可以使用filter和map组合。

 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);