jQuery toggleClass example

Toggle class name on click in jQuery

JavaScript

var collections = [
  [1],
  [],
  [],
  [2],
  []
];
var settings = [
  [5],
  [6],
  [7],
  [8]
];

collections.forEach(function(collection, index) {
  if (collection.length === 0) {
    collections[index] = null;
    if (settings[index]) {
      settings[index] = null;
    }
  }
})

// then filter out the nulls
collections = collections.filter(function (v) { return v !== null });
settings = settings.filter(function (v) { return v !== null });

console.log('cols:', collections, 'setts:', settings);