SOURCE

let arr = [21,321,32,65,3,6,6,122,552,32,3];

function fun(arr){
  let len = arr.length;
  for(let i=0;i<len;i++){
    for(let j=0;j<len-i-1;j++){
      if(arr[j] > arr[j+1]){
        let num = arr[j+1];
        arr[j+1] = arr[j];
        arr[j] = num;
      }
    }
  }
  return arr;
}

console.log(fun(arr));