code: function ( obj ) {
  		var result = 0;
  
  		if ( obj.length > 0 ) {
  			result = obj.reduce( function ( prev, cur ) {
  				return prev + cur;
  			});
  		}
  
  		return result;
  	}
docs: Gets the summation of an Array of numbers
  
  @method sum
  @param  {Array} obj Array to sum
  @return {Number}    Summation of Array