javascript - 填写 addFullName 函数的代码

Question

基本对象问题我似乎无法全神贯注。我确定我想多了。 填写 addFullName 函数的代码。该函数应该:

Take one input parameter, a person object. Add a property called fullName to the person object when called. The new fullName property is set to the string 'firstName lastName' (one string, with a space between the two names) Modify the object passed in without returning anything.

// an example `person` object
var person = {
    firstName: 'Joseph',
    lastName: 'Magnolia',
    ageInYears: 34
}

function addFullName(personObj) {
  /* your code here */
  person.fullName = personObj.firstName + ' ' + personObj.lastName;
}

测试结果:

✗ it should set fullName property to 'Joseph Magnolia'
  Error:
    fullName does not equal 'Joseph Magnolia': expected undefined to deeply equal 'Joseph Magnolia'
✗ it should set fullName property to 'Michael Smith'
  Error:
    fullName does not equal 'Michael Smith': expected undefined to deeply equal 'Michael Smith'

Answer 1

您的代码非常接近，您只需使用作为参数传递给函数的变量/对象。该参数称为 personObj，应该在函数内部使用以处理传递给函数的任何 Person 对象。

// an example `person` object
var person = {
    firstName: 'Joseph',
    lastName: 'Magnolia',
    ageInYears: 34
}

function addFullName(personObj) {
  // You want to use the variable/object passed to the function
  personObj.fullName = personObj.firstName + ' ' + personObj.lastName;
}

addFullName(person);
alert('Joseph Magnolia' === person.fullName);

ES6 改进

如果你使用 ES6，你可以使用模板字符串:

function addFullName(personObj) {
  // You want to use the variable/object passed to the function
  personObj.fullName = `${personObj.firstName} ${personObj.lastName}`;
}