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 TL 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 team lead.
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 team lead
- Describe the biggest difference between
.forEach&.map.
.forEach allows the function that it takes as an argument to change the values of the array that it is being called on while .map returns a brand new array which is a version of the initial array that has been modified by the argument function.
- What is the difference between a function and a method?
A function is a block of code that can take some inputs in the form of parameters and can produce an output value in the form of a return value. It has its own scope as well which means that variables and functions that are declared inside of the function cannot be directly used outside of it (there are some exceptions such as when an inner function that changes a variable inside the outer function is returned by an outer function). A method is the same as a function except that a method is a function that belongs to an object.
- What is closure?
A closure is when a function wants access not only to the functions and variables contained within it meaning its own scope or lexical environment, but also needs to access to those variables and functions that are in a outer lexical environment. An inner function can have an increase in the variables and functions that it has access to by being passed as an argument to another function that was declared at the same scope level (lets call it a sibling function) or by being returned by the outer function. This is called exposing the inner function.
- Describe the four rules of the 'this' keyword.
Rule #1: When the function that 'this' resides in is in the global scope, the value of 'this' is the window.
Rule #2: When a function is called with the syntax "object.function" the object to the left of the dot is the value of 'this'.
Rule #3: In a constructor function 'this' is the instance of the object that is created with that constructor function. Example: When creating a new object called Tyler with a constructor called Person, Tyler is the value of 'this'.
Rule #4: 'this' can be explicitly defined with the call, apply, and bind methods when we want to override the implied value of 'this' */
- Why do we need super() in an extended class?
We need super() in an extended class in order to inherit the attributes and prototype of the parent class, which is why it accepts an attributes object as an argument. This gives the child class access to the key value pairs and methods of the parent class in addition to those that belong to the child class.
Follow these steps to set up and work on your project:
- Create a forked copy of this project.
- Add TL 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 team lead as a Reviewer on the Pull-request
- TL 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!