function baseFind(collection, predicate, eachFunc, retKey) {
    var result;
    eachFunc(collection, function(value, key, collection) {
      if (predicate(value, key, collection)) {
        result = retKey ? key : value;
        return false;
      }
    });
    return result;
  }
The base implementation of methods like `_.find` and `_.findKey`, without
support for iteratee shorthands, which iterates over `collection` using
`eachFunc`.

@private
@param {Array|Object} collection The collection to search.
@param {Function} predicate The function invoked per iteration.
@param {Function} eachFunc The function to iterate over `collection`.
@param {boolean} [retKey] Specify returning the key of the found element
 instead of the element itself.
@returns {*} Returns the found element or its key, else `undefined`.