Find unique and repeating elements in an array?

Question

code to get repeating or duplicate or non unique and non repeating or non duplicate or unique in an array using javascript

Answer 1

I think the output is coming for this code. Forgive me if I've used any unwanted things. I'm a budding developer. :)

let start = [1, 1, 2, 1, 3, 4, 5, 6, 5, 5];

let one = [];

let two = [];

let three = [];
for (let i = 0; i < start.length; i++) {
  if (!one.includes(start[i])) {
    one.push(start[i]);
  } else {
    two.push(start[i]);
  }
}

for (let j = 0; j < two.length; j++) {
  if (!three.includes(two[j])) {
    three.push(two[j]);
  }
}

console.log('Unique elements are ' + one);
console.log('Non Unique elements are ' + three);