everyObject.js.flow

/**
 * Copyright (c) 2013-present, Facebook, Inc.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 *
 * @providesModule everyObject
 * @flow
 * @typechecks
 */
'use strict';

var hasOwnProperty = Object.prototype.hasOwnProperty;
/**
 * Executes the provided `callback` once for each enumerable own property in the
 * object until it finds one where callback returns a falsy value. If such a
 * property is found, `everyObject` immediately returns false. Otherwise, it
 * returns true.
 *
 * The `callback` is invoked with three arguments:
 *
 *  - the property value
 *  - the property name
 *  - the object being traversed
 *
 * Properties that are added after the call to `everyObject` will not be
 * visited by `callback`. If the values of existing properties are changed, the
 * value passed to `callback` will be the value at the time `everyObject`
 * visits them. Properties that are deleted before being visited are not
 * visited.
 */

function everyObject(object: ?Object, callback: (value: any, name: string, object: Object) => any, context?: any): boolean {
  for (var name in object) {
    if (hasOwnProperty.call(object, name)) {
      if (!callback.call(context, object[name], name, object)) {
        return false;
      }
    }
  }

  return true;
}

module.exports = everyObject;