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Core JavaScript Coding Skills

Remember this is just a summary.
Review all the lab workbooks we worked through in class.

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Here's a detailed lab learning guide for students to develop their JavaScript skills using Node.js and Visual Studio Code:

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# Lab Guide: Fundamental JavaScript Programming with Node.js
## Objective By the end of this lab, you will be able to write simple JavaScript programs demonstrating basic programming concepts including variable assignments, comparisons, decision-making structures, loops, and functions.
## Tools Required - Node.js (latest LTS version) - Visual Studio Code
## Part 1: Setting Up Your Environment
1. Install Node.js from the official website: https://nodejs.org/ 2. Install Visual Studio Code from: https://code.visualstudio.com/ 3. Open Visual Studio Code and create a new folder for your JavaScript exercises. 4. In this folder, create a new file called `fundamentals.js`.
## Part 2: Variable Assignments and Comparisons
In `fundamentals.js`, add the following code:
```javascript // Variable assignments let x = 10; const y = 20; var z = 30;
console.log("x =", x, "y =", y, "z =", z);
// Comparisons console.log("x < y:", x < y); console.log("y > z:", y > z); console.log("x === z:", x === z); console.log("x !== y:", x !== y); ```
Run this code by opening a terminal in VS Code (Terminal -> New Terminal) and typing:
``` node fundamentals.js ```
Observe the output and make sure you understand each comparison.
## Part 3: Decision Making
Add the following code to your `fundamentals.js` file:
```javascript // If-then statement let age = 18;
if (age >= 18) { console.log("You are an adult"); } else { console.log("You are a minor"); }
// Switch statement let day = "Monday";
switch (day) { case "Monday": console.log("Start of the work week"); break; case "Friday": console.log("End of the work week"); break; default: console.log("It's a regular day"); } ```
Run the code again and observe the output. Try changing the `age` and `day` variables to see different results.
## Part 4: Loops
Add these loops to your file:
```javascript // For loop console.log("Counting from 1 to 5:"); for (let i = 1; i <= 5; i++) { console.log(i); }
// While loop console.log("Counting down from 5 to 1:"); let count = 5; while (count > 0) { console.log(count); count--; } ```
Run the code and observe how each loop behaves.
## Part 5: Functions
Add this function to your file:
```javascript // Function to calculate the square of a number function square(number) { return number * number; }
console.log("The square of 7 is:", square(7));
// Arrow function to calculate the cube of a number const cube = (number) => number * number * number;
console.log("The cube of 3 is:", cube(3)); ```
Run the code and observe how functions can be defined and used.
## Part 6: Putting It All Together
Now, let's write a program that adds the numbers from 1 to 100, stepping up by 7 each time and summing all the numbers stepped over. Add this to your file:
```javascript function sumWithStep(max, step) { let sum = 0; for (let i = 1; i <= max; i += step) { sum += i; } return sum; }
const max = 100; const step = 7; const result = sumWithStep(max, step);
console.log(`The sum of numbers from 1 to ${max}, stepping by ${step}, is: ${result}`); ```
Run this code and verify the result.
## Challenges
1. Modify the `sumWithStep` function to also return the count of numbers that were summed. 2. Create a new function that finds all prime numbers up to a given maximum number. 3. Write a program that uses a switch statement to perform different arithmetic operations (addition, subtraction, multiplication, division) based on user input.
## Conclusion
In this lab, you've practiced fundamental JavaScript concepts including variable assignments, comparisons, decision-making structures, loops, and functions. You've also written a program that performs a specific summing task. Remember to experiment with the code, try the challenges, and don't hesitate to explore further!
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This lab guide provides a structured approach to learning and practicing fundamental JavaScript concepts using Node.js and Visual Studio Code. It covers all the requested topics and includes a specific exercise for summing numbers with a step, as well as additional challenges for further practice.
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