Method getObjectKeyPermutations

src/Utils.js:219–236

* Creates an object with all permutations of the original keys. * For example, this definition: * ``` * { * a: [true, false], * b: [1, 2], * c: ['x'] * } * ``` * permutates to: * ``` * [ * { a: true, b: 1, c: 'x' }, * { a: true, b: 2, c: 'x' }, *

(object, index = 0, current = {}, results = [])

   * @param {Array} [results=[]] The resulting array of permutations.
   */
  static getObjectKeyPermutations(object, index = 0, current = {}, results = []) {
    const keys = Object.keys(object);
    const key = keys[index];
    const values = object[key];

    for (const value of values) {
      current[key] = value;
      const nextIndex = index + 1;

      if (nextIndex < keys.length) {
        Utils.getObjectKeyPermutations(object, nextIndex, current, results);
      } else {
        const result = Object.assign({}, current);
        results.push(result);
      }
    }
    return results;
  }

  /**
   * Validates parameters and throws if a parameter is invalid.