I am in the making of an apps script, that takes a specified range, divides it into subranges of 4 values each, and returns the array. It looks like this:

Code that follows that to divide it into said subranges:

function sort() {
    
    const chunks = (range, size) =>
    Array.from(
        new Array(Math.ceil(range.length / size)),
        (_, i) => range.slice(i * size, i * size + size)
    );
    let range = ranges.getValues().flat();
    var array = chunks(range, 4)
      }
    }
  } 
}

Now, what I want to do with these, is that when someone removes data from one of the subranges, the ones below will go up, so that there are no gaps between the subranges. What I mean by that, is in the case of someone clearing data from, for example, the second subrange, all the ones that are below will go up.

NOTE: It is just a function that I later use in onChange(), and the ranges variable was called earlier throughout the code, and it's just a named range.

So far I've got this piece of code, but it doesn't seem to work:

for (let i = 0; i < array.length; i++) {
      for (let j = 0; j < 4; j++) {
        var equ = 0;
        var mult = 0;
        equ += array[i][j];
        mult += array[i+1][j];
        if (equ == 0 || "" && mult != "" && 0) {
          array[i+1].copyTo(array[i], {contentsOnly:true})
        }
    }