JavaScript Program to Check Even or Odd Number

A number is even if it divides exactly by 2 (no remainder), and odd otherwise. JavaScript gives you the remainder with the modulus operator %, so checking even or odd comes down to a single comparison: number % 2 === 0.

Program to Check Even or Odd Number in JavaScript

function checkEvenOdd(num) {
  // Modulus operator gives the remainder after division by 2
  if (num % 2 === 0) {
    return `${num} is EVEN`;
  } else {
    return `${num} is ODD`;
  }
}

console.log(checkEvenOdd(32));
console.log(checkEvenOdd(11));

Output:

32 is EVEN
11 is ODD

Negative numbers work correctly too — in JavaScript, -7 % 2 evaluates to -1, not 0, so the === 0 check still classifies -7 as odd rather than even.

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Using the Ternary Operator

The if...else above can be compressed into a single line with the ternary operator (condition ? valueIfTrue : valueIfFalse), which is a common pattern once you're past the basics.

const num = 52;
const result = (num % 2 === 0) ? "EVEN" : "ODD";

console.log(`${num} is ${result}`);

Output:

52 is EVEN

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