按自定义对象数组中的属性查找条目

Question

我正在使用Typescript在Angular 2中开发应用程序，并遇到问题。我具有获取问题的阵列看起来像这样

export class Question { 

    constructor(public id: number, 
       public question_text: string, 
       public answers: string[], 
       public user_answer: string = "none") // default to none, update on user input 

    {} 
} 

private questions: Question[] = [ 
    new Question(0, 
    'How often did you eat a portion of vegetables??', 
    ['Answer A','Answer B', 'Answer C', 'Answer D', 'Answer E', 'Answer F']), 
    new Question(1, 
    'How often did you eat a portion of fruit?', 
    ['Answer A','Answer B', 'Answer C', 'Answer D', 'Answer E', 'Answer F']), 

然后我有一个按钮，允许用户编辑的问题（所有数据包括ID）的服务。我updateQuestion看起来是这样的：

updateQuestion(questionId: number, newQuestion: Question) { 
    //Find question in array 
    //Delete this entry 
    //Add new question to array 

}

我真的很首要任务挣扎：在阵列中发现的问题。我试过一些组合

this.questions.find(question => questionId == id) 

但id在这里是不确定的，我不知道如何去它。

问题基本上围绕发现问题数组中的权项其中id = questionId

任何帮助将非常感激！

Answer 1

问题出在问题模型上。我已经改变了我的问题模型是：

export class Question { 

public _id: number; 
public _question_text: string; 
public _answers: string[]; 
public _user_answer: string; 

constructor(public id: number, 
      public question_text: string, 
      public answers: string[], 
      public user_answer: string = "none") // default to none, update on user input 

{ 
    this._id = id; 
    this._question_text = question_text; 
    this._answers = answers; 
    this._user_answer = user_answer; 
} 
} 

然后我的服务：

updateQuestion(questionId: number, newQuestion: Question) { 
    const questionIndex = this.questions.findIndex(x => x._id == questionId);