code: function where(collection, properties, first) {
      return (first && isEmpty(properties))
        ? undefined
        : (first ? find : filter)(collection, properties);
    }
docs: Performs a deep comparison of each element in a `collection` to the given
  `properties` object, returning an array of all elements that have equivalent
  property values.
  
  @static
  @memberOf _
  @type Function
  @category Collections
  @param {Array|Object|string} collection The collection to iterate over.
  @param {Object} props The object of property values to filter by.
  @returns {Array} Returns a new array of elements that have the given properties.
  @example
  
  var characters = [
  { 'name': 'barney', 'age': 36, 'pets': ['hoppy'] },
  { 'name': 'fred',   'age': 40, 'pets': ['baby puss', 'dino'] }
  ];
  
  _.where(characters, { 'age': 36 });
  // => [{ 'name': 'barney', 'age': 36, 'pets': ['hoppy'] }]
  
  _.where(characters, { 'pets': ['dino'] });
  // => [{ 'name': 'fred', 'age': 40, 'pets': ['baby puss', 'dino'] }]