javascript - 如何从数组中选择一个随机对象然后将其删除以免重复？

Question

我是 Javascript 初学者，必须制作一个问答游戏。我有一系列对象，它们是问题。我想随机选择一个对象(问题)然后使用它，然后删除它，这样当我选择下一个问题时它就不会再次出现。我怎样才能正确地做到这一点？到目前为止我尝试过的是:

class Question
{
constructor(t,oA,oB,oC,oD,ans)
{
  this.title=t;
  this.optionA=oA;
  this.optionB=oB;
  this.optionC=oC;
  this.optionD=oD
  this.answer=ans;
}

  displayQuestion1R1()
 {
      userAnswer=prompt(`${this.title}\nA.${this.optionA}\nB.${this.optionB}\nC.${this.optionC}\nD.${this.optionD}`);
 }

}

Round1Questions.push(new Question("According to scientists, how old, 
approximately, is Earth?", "3 billions years", "100 million years", "4.5 
billion years","2.5 billion years", "4.5 billion years"));

Round1Questions.push(new Question("Who was the first American President?", 
"Benjamin Franklin", "Barack Obama", "George Washington","Thomas Jefferson", 
"George Washington"));

Round1Questions.push(new Question("How many Presidents have there been up to 
this year?(2019)?", "45", "40", "60","46", "45"));

Round1Questions.push(new Question("What is the largest Ocean in the world?", 
"Atlantic Ocean", "Pacific Ocean", "Indian Ocean","Arctic Ocean", "Pacific 
Ocean"));

Round1Questions.push(new Question("Which one of the following is not a 
Marvel super-hero?","Spider-Man","Hulk","Batman", "Iron Man", "Batman"));

let ri=RoundQuestions1[Math.floor(Math.random()*Round1Questions.length)];
let question1R1=Round1Questions.splice(ri, 1);

question1R1.displayQuestion1R1();

当我尝试运行它时，它说 Question1R1.displayQuestion1R1() 不是一个函数。但是，如果我删除我所拥有的拼接方法并且只是这样做 让 Question1R1=RoundQuestions1[Math.floor(Math.random()*Round1Questions.length)];然后执行 Question1R1.displayQuestion1R1() 然后它就可以工作了。然而，这不允许我从数组中删除这个问题。我怎样才能做到这一点？

Answer 1

好吧，Jack Bashford 也很接近，但是 splice 方法返回一个数组值。

class Question {
  constructor(t, oA, oB, oC, oD, ans) {
    this.title = t;
    this.optionA = oA;
    this.optionB = oB;
    this.optionC = oC;
    this.optionD = oD
    this.answer = ans;
  }

  displayQuestion1R1() {
  //  userAnswer = prompt(`${this.title}\nA.${this.optionA}\nB.${this.optionB}\nC.${this.optionC}\nD.${this.optionD}`);
    console.log( `${this.title}\nA.${this.optionA}\nB.${this.optionB}\nC.${this.optionC}\nD.${this.optionD}` )
  }
}

var Round1Questions = [];

Round1Questions.push(new Question("According to scientists, how old, approximately, is Earth ? ",
  "3 billions years ", "100 million years ", "4.5 billion years ","2.5 billion years ",
  "4.5 billion years ")
);

Round1Questions.push(new Question("Who was the first American President?",
  "Benjamin Franklin", "Barack Obama", "George Washington", "Thomas Jefferson",
  "George Washington")
);

Round1Questions.push(new Question("How many Presidents have there been up to  this year ? (2019) ? ",
  "45", "40", "60","46",
  "45")
);

Round1Questions.push(new Question("What is the largest Ocean in the world?",
  "Atlantic Ocean", "Pacific Ocean", "Indian Ocean", "Arctic Ocean",
  "Pacific Ocean ")
);

Round1Questions.push(new Question("Which one of the following is not a  Marvel super - hero ? ",
  " Spider-Man", "Hulk", "Batman", "Iron Man",
  "Batman ")
);

do {
  let
    PickQuestion_N = Math.floor(Math.random() * Round1Questions.length),
    PickedQuestion = Round1Questions.splice(PickQuestion_N, 1)[0]
  ;

  PickedQuestion.displayQuestion1R1();

} while (Round1Questions.length > 0)