Оставить только уникальные значения в массиве

let arr = ['', '123', 123, '111', 'asd', 441, 1, 23, 123, '', '111']
let uniqueArray = []
for(let i = 0; i < arr.length; i++){
  if(uniqueArray.indexOf(arr[i]) === -1 && arr[i] !== ''){
    uniqueArray.push(arr[i])
  }
}
 
console.log(uniqueArray) //["123",123,"111","asd",441,1,23]

let arr = ['', '123', 123, '111', 'asd', 441, 1, 23, 123, '', '111']
 
for(let i = 0; i < arr.length; i++){
    for(let j = i + 1; j < arr.length; j++){
        if(arr[i] === arr[j]) arr.splice(j,1)
    }
}
 
console.log(arr) //["","123",123,"111","asd",441,1,23]

let arr = ['', '123', 123, '111', 'asd', 441, 1, 23, 123, '', '111'];
let res = [];
for (let i = 0; i < arr.length; i++) {
  if (arr.indexOf(arr[i]) === i) res.push(arr[i]);
}
console.log(res);

arr = arr.filter((e,i,a)=>arr.indexOf(e)===i);

JSON.stringify(arr).match(/(\b([a-z]|\d)+\b)(?!.*?\b\1\b)/g)

function uniq(arr) {
  let newArr = [];
  for (let i = 0; i < arr.length; ++i) {
    let found = false;
    for (let j = 0; j < newArr.length; ++j) {
      if (arr[i] === newArr[j]) {
        found = true;
        break;
      }
    }
 
    if (!found) newArr.push(arr[i]);
  }
 
  return newArr;
}
 
const arr = [1, 2, "3", 4, "3", 2, 5];
console.log(uniq(arr));

function getUniqueElements(array) {
  const uniqueElements = [];
 
  for (let i = 0; i < array.length; i++) {
    const element = array[i];
 
    let found = false;
 
    for (let j = 0; j < uniqueElements.length; j++) {
      if (uniqueElements[j] === element) {
        found = true;
        break;
      }
    }
 
    if (!found) {
      uniqueElements.push(element);
    }
  }
 
  return uniqueElements;
}