justinhwu / js-data-structures-objects-lab-dc-web-career-040119

Objects Lab

Problem Statement

We covered the concepts of Objects in JavaScript. Now it's time to put the concepts into practice.

Objectives

1. Create Objects
2. Perform operations on Objects

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.

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" }

Something to keep in mind!

Conclusion

In this lab, we worked with creating Objects and performing operations on them.

Resources

• MDN: Object

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