Alternative to LoDash 'groupBy' that preserves original order

groupByKeepOrder

/**
  * @description Groups items from an array into an array of objects, grouped by a property 'prop' name, maintaining original order. Based on functionality of LoDash's 'groupBy' function, but, unlike LoDash, preserves original array's order and returns an array instead of an object.
  * @param arr {array of objects} - Objects within array should contain a property marked by the 'prop' argument, or else they will be excluded from the output and a warning will be logged.
  * @param prop {string} Propery to use for grouping. The value of this will be converted to a string when creating group names.
  */
var groupByKeepOrder = function(arr, prop) {
    var newArr = [] // array to return, keeps track of order
      , wrapObj = {}; // temporary object used for grouping

  _.forEach(arr, function (item) {

      // gets property name to group by and converts it to a string for grouping purposes
      var propName = item[prop];
      if(propName) {
          propName = propName.toString();

          // checks if group exists already and creates a new group if not, pushing it into the array to return ('newArr')
          if (!wrapObj[propName]) {
              wrapObj[propName] = [];
              newArr.push(wrapObj[propName]);
          }

          // adds item to the group
          wrapObj[propName].push(item);
      } else {
          console.warn("utils -> groupByKeepOrder", "Property '" + prop + "' not found within object. It will be ignored from the output.", item);
      }
  });

  delete wrapObj; // don't need this anymore
  return newArr
}

works great man, thanks

Working as expected. Thanks for the Gist.

Thanks for the code.