如何检查数组中是否存在特定的对象元素（不是属性）？

Question

我尝试使用 .includes() 方法，但我无法让它工作。data = [{    "Global Quote": {        "01. symbol": "TSLA",        "02. open": "256.7100",        "03. high": "260.4800",        "04. low": "254.5100",        "05. price": "260.1700",        "06. volume": "4967930",        "07. latest trading day": "2019-07-23",        "08. previous close": "255.6800",        "09. change": "4.4900",        "10. change percent": "1.7561%"    }}]data.includes("Global Quote") ? console.log("found") : console.log("not found");控制台每次都记录“未找到”...

Answer 1

如果要检查数组是否包含至少一个具有特定属性的对象，可以使用 some

找到属性的示例：

var data = [{

  "Global Quote": {}

}]

data.some(o => "Global Quote" in o) ? console.log("found") : console.log("not found ");

未找到属性的示例：

var data = [{

    "Not Global Quote": {},

  },

  {

    "Not Global Quote Also": {},

  }

]

data.some(o => "Global Quote" in o) ? console.log("found") : console.log("not found ");

Answer 2

假设您将在该数组中拥有多个对象，您可以使用some.

const data = [{

  "Global Quote": {

    "01. symbol": "TSLA",

    "02. open": "256.7100",

    "03. high": "260.4800",

    "04. low": "254.5100",

    "05. price": "260.1700",

    "06. volume": "4967930",

    "07. latest trading day": "2019-07-23",

    "08. previous close": "255.6800",

    "09. change": "4.4900",

    "10. change percent": "1.7561%"

  }

}];

function findKey(arr, key) {

  return arr.some(obj => Object.keys(obj)[0] === key);

}

console.log(findKey(data, 'Global Test'));

console.log(findKey(data, 'Global Quote'));

Answer 3

在检查带有data.includes(...).

您必须更深入一层并使用hasOwnProperty方法检查属性。

您的代码将如下所示：

const data = [{

    "Global Quote": {

        "01. symbol": "TSLA",

        "02. open": "256.7100",

        "03. high": "260.4800",

        "04. low": "254.5100",

        "05. price": "260.1700",

        "06. volume": "4967930",

        "07. latest trading day": "2019-07-23",

        "08. previous close": "255.6800",

        "09. change": "4.4900",

        "10. change percent": "1.7561%"

    }

}]

data[0].hasOwnProperty('Global Quote') ? console.log('found') : console.log('not found);