javascript - 从对象数组中，如何获取该对象值与变量匹配的对象值？

Question

假设您有一个对象数组。

let dogs = [
  { 
    colour: "blue",
    breed: "poodle"
  },
  { 
    colour: "yellow",
    breed: "poodle"
  },
  { 
    colour: "red",
    breed: "laborator"
  }
];

按品种配对时，颜色怎么取？

我试过:

let myFavouriteColour = dogs.find(dog => {
   if (dog.breed === "laborator") return dog.colour
});

这会返回一个符合上述条件的对象；我只希望它返回 colour 属性中的值。

Answer 1

一旦你.find一个匹配项，返回true(或者只返回一个相等性测试)，然后访问.find外部匹配对象的属性:

let dogs = [
  { 
    colour: "blue",
    breed: "poodle"
  },
  { 
    colour: "yellow",
    breed: "poodle"
  },
  { 
    colour: "red",
    breed: "laborator"
  }
];

const laborator = dogs.find(dog => dog.breed === "laborator");
if (laborator) {
  const myFavouriteColour = laborator.colour;
  console.log(myFavouriteColour);
}