Here is code to sort data

 var data = [40,30,12,25];
for (var i = 0; i < data.length; i++) {
  // console.log(i)
  for (var j = 0; j < data.length; j++) {
   if(data[j]>data[j+1]){
     let temp = data[j];
     data[j]= data[j+1]
     data[j+1] = temp
   }
  }
}
console.log(data)