10 Javascript Exercises with Objects

Continuing the idea of ten exercises for arrays, I made a collection of tasks for objects. Like the previous one, this collection is oriented for junior and middle javascript developers.

For every task, I will provide a description, expected result, and solution. I do not claim every solution is the best approach to solve the exercises, but I hope it eventually would help you to improve your skills.

Also, I would like to mention that I won’t handle all the error cases, like passing undefined, null, or wrong data types, I provide a basic solution, not writing a library for production.

You can start in your repository or clone mine. In that repository, you can find a full list of exercises and solutions. Also, you can easily check your solutions with pre-created tests. Link: https://github.com/andrewborisov/javascript-practice.

1. isPlainObject - Write a method that verifies an argument is a plain object, not an array or null

/**
 * Task description: Write a method that verifies an argument is a plain object, not an array or null
 * Expected Result: True if object is plain, false otherwise. 
     ({ a: 1 }) => true, 
     ([1, 2, 3]) => false
 * Task complexity: 1 of 5
 * @param element - element to verify
 * @returns {boolean}
 */
export const isPlainObject = (element) => {
  throw…