Push 3 random names into a new Array

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I cant get the following code to return 3 random names from that array, any suggestions? (The duplicate question didn't adress my problem, hence my problem is 3 values instead of 1 value.)

function navn() {
    var arr = ["Hans", "Ole", "Nils", "Olav", "Per", "Knut", "Kari", "Line", "Pia"];
    var nyArr = arr.filter(function (number) {
        return number % 3 === 0;
    });
}

There are different possibilities to solve this, another thing which isn't mentioned in the question: should those 3 names be unique or can duplicates happen?

right now all solutions including this one can have the name twice or even three times in the result array.

Additionally I split the code up in several functions, and made one where you can input an array of values and an amount of how many random values you want to get from it back:

    var arr = ["Hans", "Ole", "Nils", "Olav", "Per", "Knut", "Kari", "Line", "Pia"];
    
    function getRandomNames(arr, amount){
      var result = [];
      for(var i = 0; i < amount; i++){
        result.push(arr[getRandomIndex(arr.length)]);
      }
      return result;
    }
    
    function getRandomIndex(maxIndex){
      return Math.floor(Math.random() * maxIndex);
    }
    
    console.log(getRandomNames(arr, 3));

Using just a single line of code, learn how to randomly pick an item from an array. Your friends all give different answers. Replace myArray with the name of the variable that actually stores your array. When Kirupa isn't busy writing about himself in 3rd person, he is practicing social distancing…even on his Twitter,  The total variable contains the new length of the array. let sports = ['soccer', 'baseball'] let total = sports.push('football', 'swimming') console.log(sports) // ['soccer', 'baseball', 'football', 'swimming'] console.log(total) // 4.

You can loop through setting a random variable. I'm assuming you don't want duplicates so you also splice the array (and base the random value based on the length of the original array)

function navn () {
      var arr = ["Hans","Ole","Nils","Olav","Per","Knut","Kari","Line","Pia"];
      let return_arr = [];
     for (let i = 0; i < 3; i++) {
        var random_int = Math.round(Math.random()*(arr.length -1));
        return_arr.push(arr[random_int]);
        arr.splice(random_int, 1);
     }
     return return_arr;
}

console.log(navn());

It then asks the user for another integer such as 3 and stores it in the variable factor The file Random Numbers.xlsx contains 50,000 random numbers in column The effect of all the switching should be to push the 1 down to the bottom of the list lists in two arrays and then creates two new arrays of customer names and  The push () method adds new items to the end of an array, and returns the new length. Note: The new item (s) will be added at the end of the array. Note: This method changes the length of the array. Tip: To add items at the beginning of an array, use the unshift () method. Browser Support. The numbers in the table specify the first browser

You can reduce the input array to a subset by splicing the input array's values into a new array:

var a = ["Hans", "Ole", "Nils", "Olav", "Per", "Knut", "Kari", "Line", "Pia"];

const navn = (arr, count) => {
  return arr.reduce((acc, val) => {
    // Get a ~ random number
    let rand = Math.floor(Math.random() * Math.floor(count));
    // Extract the corresponding element, into our accumulator
    acc.length < count && (acc.push(arr.splice(rand, 1)[0]));

    return acc;
  }, []);
}

// Test
console.dir(navn(a, 3));

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Here's an ES6+ function. You take in any array and the number of random values you want and it'll spit them out without duplicates and prevent improper use of the function by disallowing a number greater than the number of unique values.

 random = (arr, n) => {
    let l = [...new Set(arr)].length, res = new Set(), r = () => arr[Math.random() * l | 0]
    if (n > l) throw new Error("length is greater than n unique values");
    while (res.size < n) res.add(r());
    return [...res];
  }

let arr = ["Hans", "Ole", "Nils", "Olav", "Per", "Knut", "Kari", "Line", "Pia"];

  random = (arr, n) => {
    let l = [...new Set(arr)].length, res = new Set(), r = () => arr[Math.random() * l | 0]
    if (n > l) throw new Error("length is greater than n unique values");
    while (res.size < n) res.add(r());
    return [...res];
  }

console.log(random(arr, 9));
console.log(random(arr, 5));

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You can generate a Set of three random indices and get the elements at that index (Set ensures no duplicates).

function navn() {
  var arr = ["Hans", "Ole", "Nils", "Olav", "Per", "Knut", "Kari", "Line", "Pia"];

  var randomIndices = new Set();
  while (randomIndices.size < 3) {
    randomIndices.add(Math.floor(Math.random() * arr.length));
  }

  var nyArr = [...randomIndices].map(function(i) {
    return arr[i];
  });

  return nyArr;
}

console.log(navn());
console.log(navn());
console.log(navn());

Here are 2 ways to combine your arrays and return a NEW array. Merge Array with Push 🤔; Browser Support; Resources isArray = [1, 2, 3]; const notArray = '​random'; combineArray(isArray, notArray); // [ 1, 2, 3, 'r', 'a', 'n', 'd', 'o', 'm' ]. The call to new Array(number) creates an array with the given length, but without elements. The length property is the array length or, to be precise, its last numeric index plus one. It is auto-adjusted by array methods. If we shorten length manually, the array is truncated. We can use an array as a deque with the following operations:

2. var currentIndex = array.length, temporaryValue, randomIndex;. 3 Javascript queries related to “javascript randomly shuffle array” angularjs filter array of objects based on name prop · angularjs http query parameters create an empty array js · create an object inside function and push it into an array  Ruby array creation. An array in Ruby is an object. Arrays can be instantiated with the new method. #!/usr/bin/ruby nums = Array.new nums.push 1 nums.push 2 nums.push 3 nums.push 4 nums.push 5 puts nums. In the script we first create a nums array. Then we add five integers to it.

However, with the use of Dynamic Arrays and the new RANDARRAY new calculation Duration: 5:24 Posted: Apr 12, 2019 Empties the array. The length of the array will be zero. Concat: Concat joins two or more arrays. Join: Joins the contents of an array into one string. Pop: Removes the last element of the array and returns it. Push: Adds value to the end of the array. RemoveAt: Removes the element at index from the array. Shift: Removes the first element of

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Comments
  • number % 3 is a mathematical operation. It'll never return three random names.
  • Aaah, I see. What do I put there then?
  • Possible duplicate of Getting a random value from a JavaScript array
  • It basically is a duplicate of the question - you just have to do that 3 times obviously.
  • Okay, I'll try. I'm still a newbie, so I'm trying
  • This works but allows duplicate values. Not sure OP wants two of the same name in their new array.
  • No, dont want duplicates. Sorry for the misunderstanding.
  • You are an angel. Thank you so much