Welcome to Day 4 of your JavaScript learning journey!

Today is all about practice — putting your basic knowledge into action with real beginner-friendly exercises.

By the end of this article, you’ll be comfortable with variables, operators, conditions, loops, arrays, and basic functions.

Let’s dive in!

1. Variables & Basic Math Operations

Let’s start by working with variables and numbers. You'll use basic arithmetic to perform calculations.

// Declare two numbers
let num1 = 10;
let num2 = 5;

// Perform operations
let sum = num1 + num2;         // Addition
let difference = num1 - num2;  // Subtraction
let product = num1 * num2;     // Multiplication
let quotient = num1 / num2;    // Division

// Output results
console.log("Sum:", sum);
console.log("Difference:", difference);
console.log("Product:", product);
console.log("Quotient:", quotient);

✅ Challenge:

  • Try changing num1 and num2 to different values.
  • Add a new variable for modulus (%) to get the remainder.

2. Conditions & User Input Practice

Here we’ll use prompt() to get user input, and if...else to make decisions based on the input.

// Ask the user for their age
let age = prompt("Enter your age:");

// Use if/else to check age
if(age >= 18) {
  console.log("✅ You are an adult.");
} else {
  console.log("⛔ You are underage.");
}

// Ask for a number and check if it’s even or odd
let number = prompt("Enter a number:");
if(number % 2 === 0) {
  console.log("The number is Even.");
} else {
  console.log("The number is Odd.");
}

✅ Challenge:

  • Add another if block to check if age is exactly 18.
  • Write a custom message for age below 10.

3. Loops, Arrays & Functions

Now let’s get hands-on with arrays, loops, and reusable functions.

// Create an array
let fruits = ["Mango", "Banana", "Orange"];

// Use a loop to display all fruits
for(let i = 0; i < fruits.length; i++) {
  console.log("🍉 Fruit:", fruits[i]);
}

// Function to greet a user
function greetUser(name) {
  console.log(`Hello, ${name}! Welcome to JavaScript.`);
}
greetUser("Dhanian");

// Function to double a number
function double(num) {
  return num * 2;
}
console.log("Double of 5 is:", double(5));

✅ Challenge:

  • Add a new fruit to the array and log it.
  • Create a new function that takes two numbers and returns the bigger one.

Keep Practicing!

The best way to learn JavaScript is through consistent practice. These small exercises will build the foundation for larger real-world projects.

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