Check Even or Odd - JavaScript Program

// Method 1: Using if-else let number = 7; if (number % 2 === 0) { console.log(number + " is even"); } else { console.log(number + " is odd"); } // Method 2: Using ternary operator let num = 8; let result = (num % 2 === 0) ? "even" : "odd"; console.log(num + " is " + result); // Method 3: Using function function checkEvenOdd(n) { if (n % 2 === 0) { return "even"; } else { return "odd"; } } console.log("10 is " + checkEvenOdd(10)); console.log("15 is " + checkEvenOdd(15));

This program demonstrates conditional logic using the modulus operator.

Modulus Operator (%)

The modulus operator returns the remainder after division:

number % 2 === 0 → Even number
number % 2 === 1 → Odd number

If-Else Statement

Basic conditional structure:

javascript
if (condition) {
    // code if true
} else {
    // code if false
}

Ternary Operator

Shorthand for if-else:

javascript
condition ? valueIfTrue : valueIfFalse

Comparison Operators

===: Strict equality (checks value and type)
!==: Strict inequality
==: Loose equality (avoid, can cause bugs)
!=: Loose inequality (avoid)

Best Practice: Always use `===` for equality checks!

Function Approach

Creating reusable function:

javascript
function checkEvenOdd(n) {
    return (n % 2 === 0) ? "even" : "odd";
}

Edge Cases

javascript
checkEvenOdd(0);   // "even"
checkEvenOdd(-2);  // "even"
checkEvenOdd(-3);  // "odd"

Output