someSet.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 someSet
 * @flow
 * @typechecks
 */
'use strict';

import type Set from "./Set";
/**
 * The someSet() method tests whether some elements in the given Set pass the
 * test implemented by the provided function.
 */

function someSet<T>(set: Set<T>, callback: (value: T, key: T, set: Set<T>) => boolean, context?: any): boolean {
  var iterator = set.entries();
  var current = iterator.next();

  while (!current.done) {
    var entry = current.value;

    if (callback.call(context, entry[1], entry[0], set)) {
      return true;
    }

    current = iterator.next();
  }

  return false;
}

module.exports = someSet;