Best way to flatten JS object (keys and values) to a single depth array

Question

I have written this small function to get all keys and values of an object and store them into an array. The object might contain arrays as values...

Object {

Answer 1

This solution can handle deeply nested objects

const isObject = o => o && typeof o === 'object' && !(o instanceof Date);

const flattenObject = obj => Object.entries(obj).reduce((acc, [key, val]) => ({
  ...acc, ...(isObject(val) ? flattenObject(val) : { [key]: val })
}), {});

Remember that this function returns an empty object for strings, dates, numbers, etc.