按自定義對象數組中的屬性查找條目

Question

我正在使用Typescript在Angular 2中開發應用程序，並遇到問題。我具有獲取問題的陣列看起來像這樣

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']), 

然後我有一個按鈕，允許用戶編輯的問題（所有數據包括ID）的服務。我updateQuestion看起來是這樣的：

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

}

我真的很首要任務掙扎：在陣列中發現的問題。我試過一些組合

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

但id在這裏是不確定的，我不知道如何去它。

問題基本上圍繞發現問題數組中的權項其中id = questionId

任何幫助將非常感激！

Answer 1

問題出在問題模型上。我已經改變了我的問題模型是：

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; 
} 
} 

然後我的服務：

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