在freecodecamp中不接受JS代码

Question

我正在通过freecodecamp工作，并参与以下练习：

https://learn.freecodecamp.org/javascript-algorithms-and-data-structures/basic-javascript/profile-lookup

现在我的代码如下：

＆＃13;

＆＃13;

var contacts = [{
  "firstName": "Akira",
  "lastName": "Laine",
  "number": "0543236543",
  "likes": ["Pizza", "Coding", "Brownie Points"]
}, {
  "firstName": "Harry",
  "lastName": "Potter",
  "number": "0994372684",
  "likes": ["Hogwarts", "Magic", "Hagrid"]
}, {
  "firstName": "Sherlock",
  "lastName": "Holmes",
  "number": "0487345643",
  "likes": ["Intriguing Cases", "Violin"]
}, {
  "firstName": "Kristian",
  "lastName": "Vos",
  "number": "unknown",
  "likes": ["Javascript", "Gaming", "Foxes"]
}];


function lookUpProfile(name, prop) {
  // Only change code below this line
  // Only change code below this line

  for (var i = 0; i < contacts.length; i++) {
    if (contacts[i].firstName == name) {
      foundName += 1;
    }
    if (contacts[i].firstName == name && contacts[i].hasOwnProperty(prop)) {
      return contacts[i][prop];
    } else if (contacts[i].firstName == name && contacts[i].hasOwnProperty(prop) == false) {
      return "No such property";
    }
  }
  if (foundName < 1) {
    return "No such contact"
  };
}

var foundName = 0;

// Only change code above this line


// Change these values to test your function
var ans = lookUpProfile("Bob", "number");
console.log(ans);

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＆＃13;

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所以我用我的for循环遍历预定义的数组，并且我检查了name == firstName和对象具有prop属性的实例。在这些情况下，我将归还财产。否则，我返回＆＃34;没有这样的财产＆＃34;。我还改变了我的变量foundName，这样当firstName与循环中的name匹配时，foundName得到一个正值。如果foundName小于1（即找不到名称匹配），那么我返回＆＃39;没有这样的联系＆＃39;。

现在，当我在浏览器中运行它并查看控制台时，它似乎完美无缺。但是，当我将此答案输入freecodecamp时，我得到：

＆＃34; Bob＆＃34;，＆＃34; number＆＃34;应该返回＆＃34;没有这样的联系＆＃34; ＆＃34; Bob＆＃34;，＆＃34;马铃薯＆＃34;应该返回＆＃34;没有这样的联系＆＃34;

但是，如果我把，例如，＆＃34; Bob＆＃34;和＆＃34;数字＆＃34;进入这个功能，我确实得到了＃34;没有这样的联系＆＃34; ......我一定会错过这里显而易见的东西，但我对此非常困惑!!

Answer 1

问题在于您的变量 foundName 每次调用函数 lookUpProfile 时更改全局变量 foundName 所以当您调用函数时** lookUpProfile ** with＆＃39; bob＆＃39;作为参数，它将返回 undefined ，因为 foundName 的值大于1，因此您需要将变量范围限定为功能块范围，您应该定义变量 foundName 不在其中，也停止使用关键字 var ，而是使用让

查看下面的解决方案

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//Setup
var contacts = [
    {
        "firstName": "Akira",
        "lastName": "Laine",
        "number": "0543236543",
        "likes": ["Pizza", "Coding", "Brownie Points"]
    },
    {
        "firstName": "Harry",
        "lastName": "Potter",
        "number": "0994372684",
        "likes": ["Hogwarts", "Magic", "Hagrid"]
    },
    {
        "firstName": "Sherlock",
        "lastName": "Holmes",
        "number": "0487345643",
        "likes": ["Intriguing Cases", "Violin"]
    },
    {
        "firstName": "Kristian",
        "lastName": "Vos",
        "number": "unknown",
        "likes": ["JavaScript", "Gaming", "Foxes"]
    }
];

function lookUpProfile(name, prop) {
  // Only change code below this line
  // Only change code below this line
   let foundName = 0;
  for (var i = 0; i < contacts.length; i++) {
    if (contacts[i].firstName == name) {
      foundName += 1;
    }
    if (contacts[i].firstName == name && contacts[i].hasOwnProperty(prop)) {
      return contacts[i][prop];
    } else if (contacts[i].firstName == name && contacts[i].hasOwnProperty(prop) == false) {
      return "No such property";
    }
  }
  if (foundName < 1) {
    return "No such contact"
  };
}




// Only change code above this line


// Change these values to test your function
// Change these values to test your function
lookUpProfile("Akira", "likes");

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Answer 2

您的对象声明不正确：contacts是一个数组。

该功能有效，但您需要将foundName保留在函数中而不是外部。否则，如果你运行你的功能两次，它将会中断。

以下是工作代码：

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const contacts = [{
  "firstName": "Akira",
  "lastName": "Laine",
  "number": "0543236543",
  "likes": ["Pizza", "Coding", "Brownie Points"]
}, {
  "firstName": "Harry",
  "lastName": "Potter",
  "number": "0994372684",
  "likes": ["Hogwarts", "Magic", "Hagrid"]
}, {
  "firstName": "Sherlock",
  "lastName": "Holmes",
  "number": "0487345643",
  "likes": ["Intriguing Cases", "Violin"]
}, {
  "firstName": "Kristian",
  "lastName": "Vos",
  "number": "unknown",
  "likes": ["Javascript", "Gaming", "Foxes"]
}];


function lookUpProfile(name, prop) {

  let foundName = 0;

  for (var i = 0; i < contacts.length; i++) {
    if (contacts[i].firstName == name) {
      foundName += 1;
    }
    if (contacts[i].firstName == name && contacts[i].hasOwnProperty(prop)) {
      return contacts[i][prop];
    } else if (contacts[i].firstName == name && contacts[i].hasOwnProperty(prop) == false) {
      return "No such property";
    }
  }
  if (foundName < 1) {
    return "No such contact"
  };
}

console.log(lookUpProfile("Kristian", "lastName"))
console.log(lookUpProfile("Bob", "number"))

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