/**
 * Copyright 2023 Gravitational, Inc
 *
 * 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.
 */

/**
 * pipe takes an array of unary functions as an argument. It returns a function that accepts a value
 * that's going to be passed through the supplied functions.
 *
 * @example
 * // Without pipe.
 * const add1ThenDouble = (x) => double(add1(x));
 *
 * // With pipe.
 * const add1ThenDouble = pipe(add1, double);
 */
export const pipe =
  <PipeSubject>(...fns: Array<(pipeSubject: PipeSubject) => PipeSubject>) =>
  (x: PipeSubject) =>
    fns.reduce((v, f) => f(v), x);