javascript - 如何通过特定属性在数组中查找特定值元素？

Question

var attributeList = [];

var attributeEmail = {
    Name : 'email',
    Value : '[e-mail]'
};
var attributePhoneNumber = {
    Name : 'phone_number',
    Value : '[phone]'
};
attributeList.push(attributeEmail);
attributeList.push(attributePhoneNumber);

结果是：

Attributes: Array(2)
1: {Name: "phone_number", Value: "[phone]"}
2: {Name: "email", Value: "[e-mail]"}

我需要找到电子邮件attributeList

var email = getEmail(attributeList);
console.log(email); // [e-mail]

private getEmailAttribute(attributeList) {
    // Name: "email"...
    return ????;
}

标签： javascriptarraysfilterfind

Answer 1

您可以使用filter()和map()获取电子邮件shift()。这个方法是安全的，它不会抛出undefined，如果没有找到email对象就会返回。

const attributeList = [];

const attributeEmail = {
  Name : 'email',
  Value : '[e-mail]'
};
const attributePhoneNumber = {
  Name : 'phone_number',
  Value : '[phone]'
};
attributeList.push(attributeEmail);
attributeList.push(attributePhoneNumber);

function getEmailAttribute(attributes) {
    return attributes
      .filter(attr => attr.Name === 'email')
      .map(attr => attr.Value)
      .shift();
}

const email = getEmailAttribute(attributeList);
console.log(email);