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| 1 | + | // 1. Variables and Data Types | |
| 2 | + | const greeting = "Hello, JavaScript world!"; // String (cannot be reassigned) | |
| 3 | + | let counter = 10; // Number (can be changed) | |
| 4 | + | const isLearning = true; // Boolean | |
| 5 | + | ||
| 6 | + | console.log(greeting); | |
| 7 | + | ||
| 8 | + | // 2. A Simple Function | |
| 9 | + | // This function takes a name as an input and returns a personalized message | |
| 10 | + | function greetUser(userName) { | |
| 11 | + | return `Welcome back, ${userName}!`; | |
| 12 | + | } | |
| 13 | + | ||
| 14 | + | // Calling the function and saving the result | |
| 15 | + | const userMessage = greetUser("Alex"); | |
| 16 | + | console.log(userMessage); | |
| 17 | + | ||
| 18 | + | // 3. Arrays (Lists) and Loops | |
| 19 | + | const programmingLanguages = ["JavaScript", "Python", "C++", "Java"]; | |
| 20 | + | ||
| 21 | + | console.log("Here are some popular languages:"); | |
| 22 | + | // Loop through each item in the array | |
| 23 | + | for (const language of programmingLanguages) { | |
| 24 | + | console.log(`- ${language}`); | |
| 25 | + | } | |
| 26 | + | ||
| 27 | + | // 4. Conditionals (If/Else Statement) | |
| 28 | + | if (counter > 5) { | |
| 29 | + | console.log("The counter is greater than 5."); | |
| 30 | + | } else { | |
| 31 | + | console.log("The counter is 5 or less."); | |
| 32 | + | } | |