JavaScript Arithmetic Operators 🔢

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JavaScript Arithmetic Operators 🔢
Arithmetic operators in JavaScript are used to perform mathematical operations on numbers.

1️⃣ List of Arithmetic Operators
Operator Symbol Example Result
Addition + 5 + 2 7
Subtraction - 5 - 2 3
Multiplication * 5 * 2 10
Division / 5 / 2 2.5
Modulus (Remainder) % 5 % 2 1
Exponentiation ** 5 ** 2 25

2️⃣ Examples of Arithmetic Operators
✅ 1. Addition (+)
Adds two numbers.

let sum = 10 + 5;

console.log(sum); // 15

📌 Note: If a string is involved, + performs string concatenation.

console.log("Hello" + " World"); // "Hello World"

console.log("10" + 5); // "105" (Number 5 is converted to a string)

✅ 2. Subtraction (-)
Subtracts the second number from the first.

let difference = 10 - 5;

console.log(difference); // 5

✅ 3. Multiplication (*)
Multiplies two numbers.

let product = 4 * 3;

console.log(product); // 12

✅ 4. Division (/)
Divides the first number by the second.

let quotient = 10 / 2;

console.log(quotient); // 5

📌 Note: If division results in a decimal, JavaScript keeps it.

console.log(10 / 3); // 3.3333...

✅ 5. Modulus (%)
Returns the remainder of a division.

console.log(10 % 3); // 1 (10 ÷ 3 = 3 remainder 1)

console.log(15 % 4); // 3 (15 ÷ 4 = 3 remainder 3)

📌 Use Case: Checking if a number is even or odd

let num = 7;

console.log(num % 2 === 0 ? "Even" : "Odd"); // "Odd"

✅ 6. Exponentiation (**)
Raises the first number to the power of the second.

console.log(2 ** 3); // 8 (2³)

console.log(5 ** 2); // 25 (5²)

📌 Alternative: Using Math.pow()

console.log(Math.pow(2, 3)); // 8

3️⃣ Special Cases in Arithmetic
✅ 1. Division by Zero (/ 0)

console.log(10 / 0); // Infinity

console.log(-10 / 0); // -Infinity



📌 Note: JavaScript returns Infinity instead of throwing an error.



✅ 2. NaN (Not a Number)



console.log("hello" * 5); // NaN

console.log(undefined + 1); // NaN



📌 Tip: Use isNaN(value) to check if a result is NaN.



🎯 Summary: Best Practices

✅ Use +, -, *, /, %, ** for mathematical operations.

✅ Watch out for type coercion with + when using strings.

✅ Use % to check even or odd numbers.

✅ Avoid operations that result in NaN.
    Date: 2025-03-29 00:00:00.000000