Check Even or Odd in JavaScript

n % 2 === 0. Remainder 0 means even. Use ===, not ==.

BeginnerConditional ProgramsExample 1 of 5

check-even-or-odd.js

1// Method 1: Using if-else
2let number = 7;
3
4if (number % 2 === 0) {
5    console.log(number + " is even");
6} else {
7    console.log(number + " is odd");
8}
9
10// Method 2: Using ternary operator
11let num = 8;
12let result = (num % 2 === 0) ? "even" : "odd";
13console.log(num + " is " + result);
14
15// Method 3: Using function
16function checkEvenOdd(n) {
17    if (n % 2 === 0) {
18        return "even";
19    } else {
20        return "odd";
21    }
22}
23
24console.log("10 is " + checkEvenOdd(10));
25console.log("15 is " + checkEvenOdd(15));

Output

7 is odd
8 is even
10 is even
15 is odd

What's going on

7 % 2 is 1 → odd. 8 % 2 is 0 → even.

-3 % 2 is -1 in JS, not 1. Python people trip here. Check n % 2 === 0 for even and treat the rest as odd.

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