Question

我有一个对象数组：

items: [
  { name: "Cheese Puffs", price: 3 },
  { name: "Can of Soda", price: 1.75 }
];

我想做类似items["cheesePuffs"] === true的事情。但是由于它在数组中，因此无法正常工作。

Answer 1

您想要的是Array.find()。

myArrOfObjects.find(el => el.cheesePuffs);

假设您要查找的属性为true，则返回元素{cheesePuffs: "yes"}为true。如果找不到，则为undefined。

Answer 2

您可以使用some和hasOwnProperty，如果您需要实际值而不是布尔值，则可以使用find而不是some

const myArrOfObjects = [{
  cheesePuffs: "yes"
},
{
  time: "212"
}];

let findByName = (name) => {
  return myArrOfObjects.some(obj=> {
    return obj.hasOwnProperty(name)
  })
}

console.log(findByName("cheesePuffs"))
console.log(findByName("time"))
console.log(findByName("123"))

Answer 3

您可以使用find

let exist = myArrOfObjects.find(o => o.cheesePuffs === 'yes')

Answer 4

好的简单解决方案

尝试

const x = [{}];

if(x.find(el => el.cheesePuffs) == undefined)
  console.log("empty objects in array ")
  
const myArrOfObjects = [{
  cheesePuffs: "yes"
},
{
  time: "212"
}];


if(myArrOfObjects.find(el => el.cheesePuffs) == undefined)
  console.log("empty objects in array ")
  else
  console.log("objects available in array ")

Answer 5

尝试以下代码。它将返回名称与“ Cheese Puffs”匹配的对象。

let items = [{
    name: "Cheese Puffs",
    price: 3
  },
  {
    name: "Can of Soda",
    price: 1.75
  }
];

let itemExist = items.find(x => x.name === 'Cheese Puffs');

if (itemExist) {
  console.log(itemExist);
} else {
  console.log("Item not Exist");
}

Answer 6

作为建议，您还可以决定不使用数组，而是使用json对象，其中每个项目的索引是对象的唯一名称（在示例中，“ cheesePuffs”标识为“ Cheese Puffs”）< / p>

let items = {
"cheesePuffs": {name: "Cheese Puffs",price: 3},
"canOfSoda": {name: "Can of Soda",price: 1.75},
};

console.log("exist: ", items.cheesePuffs!== undefined)
console.log(items.cheesePuffs)
// can also access to item in this way:
console.log(items["cheesePuffs"])

console.log("not exist", items.noCheesePuffs!== undefined)
console.log(items.noCheesePuffs)

Answer 7

首先，您有一个对象数组，因此不能简单地使用

myArrOfObjects["cheesePuffs"]

因为数组需要索引，所以它应该为myArrOfObjects[0]["cheesePuffs"]

let items = [
  { name: "Cheese Puffs", price: 3 },
  { name: "Can of Soda", price: 1.75 }
];


let filter = items.find( el => el.price === 3 );

console.log(filter);

另一种方法

  let items = [
      { name: "Cheese Puffs", price: 3 },
      { name: "Can of Soda", price: 1.75 }
    ];


    let filter = items.filter( el => el.price === 3 );

    console.log(filter);

检查是否存在对象数组

7 个答案: