Arithmetic Operators

 Used for mathematical calculations

➕ Basic Operators

let a = 10;
let b = 3;

console.log(a + b); // 13
console.log(a - b); // 7
console.log(a * b); // 30
console.log(a / b); // 3.33...
console.log(a % b); // 1 (remainder)

🔥 Increment / Decrement

let x = 5;

x++; // post-increment
console.log(x); // 6

++x; // pre-increment
console.log(x); // 7

👉 Why?

• x++ → increases after → becomes 6
• ++x → increases before → becomes 7

⚠️ Important Difference

let x = 5;

console.log(x++); // 5 (use first, then increase)
console.log(++x); // 7 (increase first, then use)

Step 1: console.log(x++)

• Current x = 5
• x++ → use first → print 5
• Then increase → x = 6

👉 Output: 5

Step 2: console.log(++x)

• Now x = 6
• ++x → increase first → becomes 7
• Then print → 7

👉 Output: 7

Easy Trick to Remember

• Post (x++) → "Use → Then Increase"
• Pre (++x) → "Increase → Then Use"

 Quick Practice

What will this print?

let x = 10;

console.log(++x); 
console.log(x++); 
console.log(x);

Answer:

• ++x → 11
• x++ → prints 11, then becomes 12
• final x → 12