How to randomly generate numbers without repetition in javascript?

Question

I want to generate each number between 0 to 4 randomly using javascript and each number can appear only once. So I wrote the code:

for(var l=0; l<5; l++)          


        

Answer 1

So many solutions to this! Here's my code for a reuseable function that takes in 3 arguments: the number of integers wanted in the array (length) and the range that the array should be comprised of (max and min).

function generateRandomArr(length, max, min) {
  const resultsArr = [];
  for (let i = 0; i < length; i++) {
    const newNumber = Math.floor(Math.random() * (max - min)) + min;
    resultsArr.includes(newNumber) ? length += 1 : resultsArr.push(newNumber);
  }
  return resultsArr;
}

generateRandomArr(10, 100, 0);
// this would give a list of 10 items ranging from 0 to 100
// for example [3, 21, 56, 12, 74, 23, 2, 89, 100, 4]