Ways to generate a unique random number from an Array without repetition using Javascript

Question

Ways to generate a unique random number from an Array without repetition using Javascript

Looking to retrieve a random number from an array of numbers known as cardNumbertemp.

    function shuffleCard(){
        randomized = Math.floor(Math.random()*cardNumbertemp.length);
        for (var i = 0; i < cardNumbertemp.length; i++){
            if (randomized === cardNumbertemp[i]){
                cardNumbertemp.splice(i, 1);
                return randomized;
            }
        }
    }

This function is designed to provide a single random number from the array (cardNumbertemp) and then remove it from the array. While it generally works well, occasionally it returns undefined values.

javascript arrays

Answer 1

Answer №1

If you're in need of a random number, consider using the code snippet below. In most cases, splicing is unnecessary unless you have no use for that particular number again.

var randomNumberArray = [45, 78, 23, 89];

(function() {
  console.log(getRandomNumber());
})();

function getRandomNumber() {
  var randomIndex = Math.floor(Math.random() * randomNumberArray.length);
  return randomNumberArray[randomIndex];
}

Answer 2

If you're in need of a random number, consider using the code snippet below. In most cases, splicing is unnecessary unless you have no use for that particular number again.

var randomNumberArray = [45, 78, 23, 89];

(function() {
  console.log(getRandomNumber());
})();

function getRandomNumber() {
  var randomIndex = Math.floor(Math.random() * randomNumberArray.length);
  return randomNumberArray[randomIndex];
}

Answer 3

Answer №2

const numbers = [12, 56, 33, 78];  

for(let j = 0; j < numbers.length + j; j++){
    // generate random number between 0 and (array length - 1)
    let randomNumber = Math.floor((Math.random() * numbers.length));

    console.log(numbers[randomNumber]); // display random value from array
    numbers.splice(randomNumber, 1); // keep track of unique random value
}

Answer 4

const numbers = [12, 56, 33, 78];  

for(let j = 0; j < numbers.length + j; j++){
    // generate random number between 0 and (array length - 1)
    let randomNumber = Math.floor((Math.random() * numbers.length));

    console.log(numbers[randomNumber]); // display random value from array
    numbers.splice(randomNumber, 1); // keep track of unique random value
}

Ways to generate a unique random number from an Array without repetition using Javascript

Answer №1

Answer №2

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