Sprint Challenge: JavaScript Fundamentals

This challenge allows you to practice the concepts and techniques learned over the past week and apply them in a survey of problems. This Sprint explored JavaScript Fundamentals. During this Sprint, you studied variables, functions, object literals, arrays, this keyword, prototypes, and class syntax. In your challenge this week, you will demonstrate proficiency by completing a survey of JavaScript problems.

Read these instructions carefully. Understand exactly what is expected before starting this Sprint Challenge.

This is an individual assessment. All work must be your own. Your challenge score is a measure of your ability to work independently using the material covered through this sprint. You need to demonstrate proficiency in the concepts and objectives introduced and practiced in preceding days.

You are not allowed to collaborate during the Sprint Challenge. However, you are encouraged to follow the twenty-minute rule and seek support from your PM and Instructor in your cohort help channel on Slack. Your work reflects your proficiency in JavaScript fundamentals.

You have three hours to complete this challenge. Plan your time accordingly.

Commit your code regularly and meaningfully. This helps both you (in case you ever need to return to old code for any number of reasons) and your project manager.

You will notice there are several JavaScript files being brought into the index.html file. Each of those files contain JavaScript problems you need to solve. If you get stuck on something, skip over it and come back to it later.

In meeting the minimum viable product (MVP) specifications listed below, you should have a console full of correct responses to the problems given.

Demonstrate your understanding of this week's concepts by answering the following free-form questions.

Edit this document to include your answers after each question. Make sure to leave a blank line above and below your answer so it is clear and easy to read by your project manager

1. Describe the biggest difference between .forEach & .map.

The biggest difference is that .map is non-mutative and returns a new array. forEach is used to iterate over every element of an array and execute a specific function.

2. What is the difference between a function and a method?

They are nearly identical except from how they can be used and where they live inside the code. A method is function that is directly assigned to an object, or class of objects, and can only be used by those objects, whereas a function is free to be used with any input.

3. What is closure?

Closure is a technique which uses a nested function to store variables created in an outer, enclosing function beyond the execution of that outer function. Normally, these variables are destroyed when the outer function completes, but using a closure allows you to access those variables through the scope of the inner function.

4. Describe the four rules of the 'this' keyword.

ONE - global object binding: when in the global scope, the value of 'this' will be bound to the window/console object.

TWO - implicit binding: when a function is called by a preceding dot, 'this' is bound to the object to the left of the dot.

THREE - new binding: when a constructor function is ued, 'this' is bound to the specific instance of the new object.

FOUR - explicit binding: when a .call or .apply method is used, 'this' is explicitly bound by using the parameters of those methods.

5. Why do we need super() in an extended class?

Super() performs the 'under-the-hood' work of prototypal inheritance, drawing in the attributes AND methods of the parent class. This one function replaces the need for Parent.call(this, att) && Child.prototype = Object.create(Parent.prototype)

Follow these steps to set up and work on your project:

• Create a forked copy of this project.
• Add PM as collaborator on Github.
• Clone your OWN version of Repo (Not Lambda's by mistake!).
• Create a new Branch on the clone: git checkout -b <firstName-lastName>.
• Create a pull request before you start working on the project requirements. You will continuously push your updates throughout the project.
• You are now ready to build this project with your preferred IDE
• Implement the project on your Branch, committing changes regularly.
• Push commits: git push origin <firstName-lastName>.

Follow these steps for completing your project:

• Submit a Pull-Request to merge Branch into master (student's Repo).
• Add your Project Manager as a Reviewer on the Pull-request
• PM then will count the HW as done by merging the branch back into master.

Your finished project must include all of the following requirements:

Pro tip for this challenge: If something seems like it isn't working locally, copy and paste your code up to codepen and take another look at the console.

Test your knowledge of objects and arrays.

• Use the objects-arrays.js link to get started. Read the instructions carefully!

This challenge takes a look at callbacks and closures as well as scope.

• Use the functions.js link to get started. Read the instructions carefully!

Create constructors, bind methods, and create cuboids in this prototypes challenge.

• Use the prototypes.js link to get started. Read the instructions carefully!

Once you have completed the prototypes challenge, it's time to convert all your hard work into classes.

• Use the classes.js link to get started. Read the instructions carefully!

In your solutions, it is essential that you follow best practices and produce clean and professional results. Schedule time to review, refine, and assess your work and perform basic professional polishing including spell-checking and grammar-checking on your work. It is better to submit a challenge that meets MVP than one that attempts too much and does not.

There are a few stretch problems found throughout the files, don't work on them until you are finished with MVP requirements!