JavaScript 测试：将布尔值更改为对象数组

Question

我正在用 JavaScript 进行测试。我被要求执行以下操作：

function IsOffline (users, name) {
  // The function called "IsOffline" receives as an argument an array of objects called 'users' and a string called 'name'.
  // each object has a property 'name' which is a string and another called 'online' which is a boolean.
  // The function must return true if the user is offline, otherwise false.
  // ex:
  // var users = [
  // {
  // name: 'toni',
  // online: true
  //},
  // {
  // name: 'emi',
  // online: true
  //},
  // {
  // name: 'john',
  // online: false
  //}
  //];
  //
  // IsOffline (users, 'emi') return false

  // Your code here:
  

我有点迷茫，不知道如何开始。感谢您的帮助。

Answer 1

您可以使用Array.find() 方法来搜索数组中的项目。

function IsOffline(users, name) {
  const foundUser = users.find(user => user.name === name)
  return foundUser ? !foundUser.online: "No user found";
}

var users = [
  { name: 'toni', online: true },
  { name: 'emi', online: true },
  { name: 'john', online: false },
];

// Online User
console.log(IsOffline(users, 'emi'))

// Offline User
console.log(IsOffline(users, 'john'))

// Unknown User
console.log(IsOffline(users, 'tom'))