Deleting a column from a multidimensional array in javascript

Try using slice. It won't alter any changes to your original array

var array = [["a", "b", "c"],["a", "b", "c"],["a", "b", "c"]]

var x = array.map(function(val) {
  return val.slice(0, -1);
});

console.log(x); // [[a,b],[a,b],[a,b]]

Iterate through the array and splice each sub array:

var idx = 2;
for(var i = 0 ; i < array.length ; i++)
{
   array[i].splice(idx,1);
}

JSFiddle.

Edit: I see you don't want to use splice due to out-of-bounds problems and array length changing. So:

1.You can check if you're out of bounds and skip the slice.
2.You can create an array of indexes you want to delete and simply create new arrays from the indexes that don't appear in that array (instead of deleting, create new arrays with the opposite condition).

Something like this:

var array = [
    ["a", "b", "c"],
    ["a", "b", "c"],
    ["a", "b", "c"]
];

var idxToDelete = [0,2];

for (var i = 0; i < array.length; i++) {
    var temp = array[i];
    array[i] = [];
    for(var j = 0 ; j < temp.length ; j++){
        if(idxToDelete.indexOf(j) == -1) // dont delete
        {
            array[i].push(temp[j]);
        }
    }
}

New JSFiddle.

This function doesn't use splice and it removes any column you want:

function removeEl(array, remIdx) {
 return array.map(function(arr) {
         return arr.filter(function(el,idx){return idx !== remIdx});  
        });
};

Hope this is what you are looking for