检查数据是否在 json 对象中可用

Question

我有一个名为answers的以下数据

{ author: 
  { 
   id: 
   username:  
  },
  _id: 
   answer: 
}
{ author: 
  { 
   id: 
   username:  
  },
  _id: 
   answer: 
}......

有什么方法可以让我使用arrays.contains("username")，而无需真正遍历所有这些并检查其中一个？

当我<%=answers%> 得到上述结果时。但我想检查特定用户名是否有任何答案。

我需要answers[author].username.contains("username")之类的东西

Answer 1

因为你有错误的 JSON

这是一个例子：

//Array
let array = [{author:{id:123,username:'abc'},_id:{answer:'wwww'}},{author:{id:456,username:'xxx'},_id:{answer:'wwwwe'}}];
let username = 'abc'
let user = array.find(value =>value.author.username === username);
//now your username contains object containing {author:{id:123,username:'abc'},_id:{answer:'wwww'}}
let answer = user._id.answer ; // 'wwww'
let filteredItems = array.filter(value => { return value._id.answer === answer });
//will return matched array.[{author:{id:123,username:'abc'},_id:{answer:'wwww'}}]

//Array
let array = [{author:{id:123,username:'abc'},_id:{answer:'wwww'}},{author:{id:456,username:'xxx'},_id:{answer:'wwww'}}];
let username = 'abc'
let user = array.find(value =>value.author.username === username);
console.log("User => "+ JSON.stringify(user))
let answer = user._id.answer ;
console.log("Answer by "+user.author.username+" => "+ answer)
let search = array.filter(value => { return value._id.answer === answer });
search.forEach((v)=>{ 
  console.log(`${v.author.username} have matched answer`)
})

Answer 2

您可以正则表达式 JSON 源，但使用 map 或 filter 将是另一个简单的解决方案。