Creating a unique array of non-repeating numbers in ES6:

Question

Creating a unique array of non-repeating numbers in ES6:

Looking to create an array of unique random numbers in ES6 without any repeats.

Currently, my function is generating an array of random numbers that are repeating:

winArray = [...Array(6)].map(() => Math.floor(Math.random() * 53));

Here is a non-ES6 solution that I came across: Non-ES6 solution

The solution using Set is not working within a for-loop:

for (let i = 1; i <= draws; i += 1) {
      // Generating a random array of 6 number

      const winArray = new Set();
      while (winArray.size < 6) winArray.add(Math.floor(Math.random() * 53));
}

javascript

Answer 1

Answer №1

If you want to generate a set of random numbers, you can use the Set object and add numbers to it until reaching the desired size.

var numbers = new Set;

while (numbers.size < 6) numbers.add(Math.floor(Math.random() * 53));

console.log(...numbers);

To generate multiple sets of random numbers, you can create a new empty set for each draw.

var numbers,
    draws = 5,
    i;

for (i = 0; i < draws; i++) {
    numbers = new Set;
    while (numbers.size < 6) numbers.add(Math.floor(Math.random() * 53));

    console.log(...numbers);
}

Answer 2

If you want to generate a set of random numbers, you can use the Set object and add numbers to it until reaching the desired size.

var numbers = new Set;

while (numbers.size < 6) numbers.add(Math.floor(Math.random() * 53));

console.log(...numbers);

To generate multiple sets of random numbers, you can create a new empty set for each draw.

var numbers,
    draws = 5,
    i;

for (i = 0; i < draws; i++) {
    numbers = new Set;
    while (numbers.size < 6) numbers.add(Math.floor(Math.random() * 53));

    console.log(...numbers);
}

Answer 3

Answer №2

The uniqueness of properties is ensured when using a Set in JavaScript.

let winArray = [...Array(6)].map(() => Math.floor(Math.random() * 53));

winArray = [...new Set(winArray)]

console.log(winArray)

Answer 4

The uniqueness of properties is ensured when using a Set in JavaScript.

let winArray = [...Array(6)].map(() => Math.floor(Math.random() * 53));

winArray = [...new Set(winArray)]

console.log(winArray)

Answer 5

Answer №3

This code offers a solution for randomizing a list of distinct numbers without any duplicates.

for (let unique=[],index=0;index<100;++index) unique[index]=index;

function mixup(array) {
  let tmp, current, top = array.length;
  if(top) while(--top) {
    current = Math.floor(Math.random() * (top + 1));
    tmp = array[current];
    array[current] = array[top];
    array[top] = tmp;
  }
  return array;
}

unique = mixup(unique);

Answer 6

This code offers a solution for randomizing a list of distinct numbers without any duplicates.

for (let unique=[],index=0;index<100;++index) unique[index]=index;

function mixup(array) {
  let tmp, current, top = array.length;
  if(top) while(--top) {
    current = Math.floor(Math.random() * (top + 1));
    tmp = array[current];
    array[current] = array[top];
    array[top] = tmp;
  }
  return array;
}

unique = mixup(unique);

Creating a unique array of non-repeating numbers in ES6:

Answer №1

Answer №2

Answer №3

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