jasondecastro / js-data-structures-objects-lab

Objects Lab

Overview

In this lab, we'll create driver objects and perform various operations on them.

Instructions

Be sure to run the tests to get a feel for the types of problems this lab is asking you to solve. In particular, you'll need to define a driver object and then apply certain updates (destructively and non-destructively) in various functions.

You'll be writing four functions:

• updateDriverWithKeyAndValue()- this function should take in a driver object, a key and a value. The function should not mutate the driver parameter and return a new driver that has an updated value for the key passed in.
• destructivelyUpdateDriverWithKeyAndValue() - this function should work the same as updateDriverWithKeyAndValue() but it should mutate the driver parameter passed in.
• deleteFromDriverByKey() - this function should take in a driver object and a key. It should delete the key/value pair for the key that was passed in from the driver object. This should all not actually mutate the driver passed in.
• destructivelyDeleteFromDriverByKey() - this function should work the same as deleteFromDriverByKey() but it should mutate the driver passed in.

Good luck!

HINT: You might find deleteFromDriverByKey() to be a bit hard to write non-destructively. Think about how we learned to use Object.assign(). What happens if we do this:

const obj = { foo: 'bar' };

const newObj = Object.assign({}, obj);

newObj;
// => { foo: "bar" }

delete newObj.foo;
// => true

newObj;
// => {}

obj;
// => { foo: "bar" }

Hmmmmm...

Resources

• MDN: Object

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