Function findKey

MathBox/mathbox-bundle.js:37055–37065

* This method is like `_.findIndex` except that it returns the key of the * first element that passes the callback check, instead of the element itself. * * If a property name is provided for `callback` the created "_.pluck" style * callback will return the property value of the

(object, callback, thisArg)

     * // => 'fred'
     */
    function findKey(object, callback, thisArg) {
      var result;
      callback = lodash.createCallback(callback, thisArg, 3);
      forOwn(object, function(value, key, object) {
        if (callback(value, key, object)) {
          result = key;
          return false;
        }
      });
      return result;
    }

    /**
     * This method is like `_.findKey` except that it iterates over elements