/**
 * Copyright 2019 Google Inc. All Rights Reserved.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *     http://www.apache.org/licenses/LICENSE-2.0
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import { Observable } from "../types.ts";
import { EOF, external } from "./external.ts";

/**
 * Creates an observable that emits a set of values.
 *
 * @typeparam T Type of the emitted value.
 * @param vs Values to emit.
 * @returns New observable that emits the given values before ending.
 */
export function just<T>(...vs: T[]): Observable<T> {
  const { next, observable } = external<T>();
  for (const v of vs) {
    next(v);
  }
  next(EOF);
  return observable;
}