[英]Function return error message doesn't work
我實際上有一個小問題:我想做一個在數組對象中循環的函數。
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(firstName, prop){
for (var i = 0; i < contacts.length; i++) {
for (var prop1 in contacts[i]) {
if (contacts[i][prop1] == firstName) {
if (contacts[i].hasOwnProperty(prop)) {
return contacts[i][prop];
}
}
}
}
}
lookUpProfile("Sherlock", "likes");
我想返回兩個錯誤:“沒有這種聯系”和“沒有這種類別”(我評論了放置“返回'沒有這種聯系'”的那部分,但這沒用...)。
試試這個代碼:
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(firstName, prop) { var contact = contacts.find(function(contact) { return contact.firstName === firstName; }); if (!contact) { return 'No such contact'; } if (!contact.hasOwnProperty(prop)) { return 'No such category'; } return contact[prop]; } console.log(lookUpProfile("Sherlock", "likes"));
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