
Job Interview Preparation
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let, const, and var to declare variables.
let name = "John"; // can change later
const age = 25; // constant, can't be changed
var city = "Delhi"; // older syntax, avoid using it
{}
▶️ Tip: Use let for variables that may change and const for fixed values.
2️⃣ Functions – Reusable Blocks of Code
function greet(user) {
return "Hello " + user;
}
console.log(greet("Alice")); // Output: Hello Alice
{}
▶️ Use functions to avoid repeating the same code.
3️⃣ Arrays – Lists of Values
let fruits = ["apple", "banana", "mango"];
console.log(fruits[0]); // Output: apple
console.log(fruits.length); // Output: 3
{}
▶️ Arrays are used to store multiple items in one variable.
4️⃣ Loops – Repeating Code
for (let i = 0; i < 3; i++) {
console.log("Hello");
}
let colors = ["red", "green", "blue"];
for (let color of colors) {
console.log(color);
}
{}
▶️ Loops help you run the same code multiple times.
5️⃣ Conditions – Making Decisions
let score = 85;
if (score >= 90) {
console.log("Excellent");
} else if (score >= 70) {
console.log("Good");
} else {
console.log("Needs Improvement");
}
{}
▶️ Use if, else if, and else to control flow based on logic.
🎯 Practice Tasks:
• Write a function to check if a number is even or odd
• Create an array of 5 names and print each using a loop
• Write a condition to check if a user is an adult (age ≥ 18)
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