Function copyArrayLike

packages/formik/src/FieldArray.tsx:109–120

(arrayLike: ArrayLike<any>)

};

const copyArrayLike = (arrayLike: ArrayLike<any>) => {
  if (!arrayLike) {
    return [];
  } else if (Array.isArray(arrayLike)) {
    return [...arrayLike];
  } else {
    const maxIndex = Object.keys(arrayLike)
      .map(key => parseInt(key))
      .reduce((max, el) => (el > max ? el : max), 0);
    return Array.from({ ...arrayLike, length: maxIndex + 1 });
  }
};

const createAlterationHandler = (
  alteration: boolean | Function,