Manipulating Objects

The Big Idea

You will work with a JavaScript object and manipulate it step by step — adding properties, changing values, deleting properties, and nesting objects — without modifying the original object literal directly.

Your Roadmap

Setup

Run the tests for this kata:

npm test 2-manipulate-objects

Object anatomy recap

Here is the object you will be working with:

const terah = {
  name: 'Terah',
  age: 32,
  height: 172,
  hairColor: 'brown',
  eyeColor: 'brown',
}

You must complete each task outside the curly braces — do not modify the object itself.

Here is the terminology used in this kata — a quick recap of an object's anatomy:

Pass the tests

Each step below matches one test. Complete them in order. After each step, run the tests to confirm it passes before moving on.

Note: Each step is its own line of code, and each builds on the code before it.

1. Define a variable adam and use object literal notation to assign this variable the value of an object with no properties.

2. Give the adam object a name key that has the value "Adam".

3. Add a spouse key to terah and assign it the value of adam.

4. Change the value of the terah age property to 33.

5. Remove the eyeColor property from terah (hint: use the delete operator).

6. Add a spouse key to the adam object and assign it the value of terah.

7. Add a children key to terah and use object literal notation to assign this variable to an empty object.

8. Add a ben property to the value of the terah children property. ben should be an object with the key name and the value "Ben".

9. Add a wilson property to the value of the terah children property. wilson should be an object with the key name with the value "Wilson".

10. Add a felicia property to the value of the terah children property. felicia should be an object with the key name with the value "Felicia".

11. Add a children property to adam and assign it the value of terah.children.

Your final terah object will be logged to the console when all the tests have passed.