Javascript random on array without repeat [duplicate]

Answer 1

I have another very small solution:

It copies the array of possible values and removes the ones, that are added to the new array.

function pickFrom(n, list) {
  const copy = Array.from(list);
  return Array.from(Array(n), () => copy.splice(Math.floor(copy.length * Math.random()), 1)[0]);
}

var quiz = [{
  "question": "What is the full form of IP?",
  "choices": ["Internet Provider", "Internet Port", "Internet Protocol"],
  "correct": "Internet Protocol"
}, {
  "question": "Who is the founder of Microsoft?",
  "choices": ["Bill Gates", "Steve Jobs", "Steve Wozniak"],
  "correct": "Bill Gates"
}, {
  "question": "1 byte = ?",
  "choices": ["8 bits", "64 bits", "1024 bits"],
  "correct": "8 bits"
}, {
  "question": "The C programming language was developed by?",
  "choices": ["Brendan Eich", "Dennis Ritchie", "Guido van Rossum"],
  "correct": "Dennis Ritchie"
}, {
  "question": "What does CC mean in emails?",
  "choices": ["Carbon Copy", "Creative Commons", "other"],
  "correct": "Carbon Copy"
}, {
  "question": "wsxwsxwsxwsxwsxwsx?",
  "choices": ["wsx", "edc", "qaz"],
  "correct": "wsx"
}, {
  "question": "qazqazqazqazqazqaz?",
  "choices": ["qaz", "wsx", "edc"],
  "correct": "qaz"
}, {
  "question": "asdasdasdasdasdasd?",
  "choices": ["asd", "qwe", "zxc"],
  "correct": "asd"
}, {
  "question": "zxczxczxczxczxczxc?",
  "choices": ["zxc", "asd", "qwe"],
  "correct": "zxc"
}, {
  "question": "qweqweqweqweqweqwe?",
  "choices": ["qwe", "asd", "zxc"],
  "correct": "qwe"
}];

console.log(pickFrom(3, quiz));

Reduced example:

function pickFrom(n, list) {
  const copy = Array.from(list);
  return Array.from(Array(n), () => copy.splice(Math.floor(copy.length * Math.random()), 1)[0]);
}

list = [1, 2, 3];

console.log("Pick 1:", pickFrom(1, list).toString());
console.log("Pick 2:", pickFrom(2, list).toString());
console.log("Pick 3:", pickFrom(3, list).toString());
console.log("Pick 3:", pickFrom(3, list).toString());
console.log("Pick 3:", pickFrom(3, list).toString());