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Filename : createChainedFunction.js
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/*
 * The MIT License (MIT)
 *
 * Copyright (c) 2015 - present Instructure, Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

/**
 * ---
 * category: utilities/react
 * ---
 * Safe chained functions
 *
 * Will only create a new function if needed,
 * otherwise will pass back existing functions or null.
 *
 * Forked from: https://github.com/react-bootstrap/react-overlays/blob/master/src/utils/createChainedFunction.js
 * @module createChainedFunction
 * @param {function} funcs to chain
 * @returns {function|null}
 */

function createChainedFunction(...funcs) {
  return funcs.filter((f, i) => {
    if (f == null) {
      return false;
    }
    // Only allow the first of identical functions
    const indexes = getAllIndexes(funcs, f);
    return indexes.length === 1 || i === indexes[0];
  }).reduce((acc, f) => {
    if (typeof f !== 'function') {
      throw new Error('Invalid Argument Type, must only provide functions, undefined, or null.');
    }
    if (acc === null) {
      return f;
    }
    return function chainedFunction(...args) {
      acc.apply(this, args);
      f.apply(this, args);
    };
    // TODO I think it can return null too
  }, null);
}

/**
 * Find all indexes for a value in an Array
 *
 * @param {array} arr The Array to search for val
 * @param {*} val The value to find indexes for
 * @return {array} All the indexes of the Array matching val
 */
function getAllIndexes(arr, val) {
  const indexes = [];
  arr.forEach((e, i) => {
    if (e === val) {
      indexes.push(i);
    }
  });
  return indexes;
}
export default createChainedFunction;
export { createChainedFunction };