2. JavaScript Exercise

Exercise Goals
Instructions
Demo 1:
1. Setup
2. Getting Down to Business
Demo 2:
Resources

Exercise Goals

This is a collection of JavaScript exercises and coding challenges. The focus in this assignment is to:

Practice problem solving.
Practice JavaScript fundamentals.
Practice using the official documentation. (We’ll be using many documentations for many libraries so it’s good to start here)

Instructions

Accept the Assignment on Canvas.

This will create a repository for you with a few starting files.

   .
   ├── .vscode
   │   └── settings.json
   ├── src
   │   ├── __tests__
   │   │   ├── 1.numbers.js
   │   │   ├── 2.strings.js
   │   │   ├── 3.arrays.js
   │   │   ├── 4.logicalOperators.js
   │   │   ├── 5.flowControl.js
   │   │   └── 6.equality.js
   │   ├── 1.numbers.js          ⬅️
   │   ├── 2.strings.js          ⬅️
   │   ├── 3.arrays.js           ⬅️
   │   ├── 4.logicalOperators.js ⬅️
   │   ├── 5.flowControl.js      ⬅️
   │   └── 6.equality.js         ⬅️
   ├── .eslintrc.json
   ├── .gitignore
   ├── package-lock.json
   ├── package.json
   └── README.md                 🔼: update this once done

you will only be working on the files marked with the arrows

Clone down the repository to your local computer.
Install the project dependencies using the npm install command.
- make sure you’re in the project directory in the terminal before you run this command.
Run the project tests using npm test You should see all the tests failing like so:
Our task would be to implement the functions in the src files (marked with ⬅️ arrow above) untill all the tests pass.
at the end of each test, commit your code git commit -m "finished test xyz".
DONT FORGET to Update the README.md file with your self assessment
- Your grade
- Self Reflection
- How long it took you to complete the assignment
push your code.

Demo 1:

Setup

Navigate to your repository in the command line.
- You can either use the cd PATH_TO_FOLDER command.
- in my case the command was cd /Users/bleach/git/School/IT3049/2.JS-Exercise
- use the pwd command to Print Working Directory and confirm your location - OR You could open VSCode integrated terminal window and it will open in the termianl already in the right path.
Installing the dependencies npm install
Run the tests using npm test.
- notice all the errors, our goal for this assignment is to resolve them all.

Getting Down to Business

Open the project in Visual Studio Code (Not Visual Studio)
Let’s try to solve a couple of those tests.

Open the file src/1.numbers.js. Particulary

   //parseInt: should use parseInt correctly to convert strings to integer numbers
   function parseInt (str) {
     return ;
   }

notice the function have an empty implementation. - We need to do something about that 🤔

Consulting the JS documeantion for the Number Data Type, you learn that there’s a function named Number.parseInt(). The documentations shows usage examples, and specifies the parameters and return type of the function.
Key Takeways:
- Be careful the Radix does not default to 10!, so we’ll have to set that optional parameter as follows
```
 function parseInt(str) {
     return Number.parseInt(str, 10);
 }
```
- Don’t forget to return something from the function.
Re-run the tests again and let’s see if it passes
commit your code git commit -m "finished test parseInt".

Demo 2:

Well, no need for the setup steps here (you should already be in the directory)

Open the file src/3.arrays.js. Particulary

   /**
     * IndexOf: you should be able to determine the location of an item in an array
     * Example: 
     * arr = [1,2,3,5,6]
     * calling the function like 
     * indexoff(arr, 3); should return the index 2
     */
     function indexOf(arr, item) {
       return ;
     }

The indexOf method is supposed to return the index of a certain element in an array. You can learn more about JS Built-in method here

my implementation for this is as follows

 function indexOf(arr, item) {
     return arr.indexOf(item);
 }

Re-run the tests again and let’s see if it passes
commit your code git commit -m "finished test: IndexOf".
On to the next test .. Rinse 🧼 and Repeat 🔁

Table of Contents