Checking Odd or Even Numbers in JavaScript

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Summary: Learn how to determine whether a number is odd or even in JavaScript. Explore simple examples and understand the underlying logic with practical code snippets.
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Checking Odd or Even Numbers in JavaScript

Determining whether a number is odd or even is a fundamental operation in programming. In JavaScript, you can easily achieve this using basic arithmetic and conditional statements. In this guide, we'll explore different methods to check if a number is odd or even and provide examples for each.

Method 1: Using the Modulus Operator

The most common method involves using the modulus operator (%). The modulus operator returns the remainder when one number is divided by another. If the remainder is 0, the number is even; otherwise, it's odd.

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In the example above, the function isEvenOrOdd takes a number as an argument and uses the modulus operator to check if it's divisible by 2. If the remainder is 0, the function returns 'Even'; otherwise, it returns 'Odd'.

Method 2: Bitwise AND Operator

Another approach is to use the bitwise AND operator (&). This method exploits the fact that the least significant bit of an even number is always 0, while it's 1 for an odd number.

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Here, the function isEvenOrOddBitwise performs a bitwise AND operation with 1. If the result is 1, the number is odd; if it's 0, the number is even.

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Choose the method that fits your coding style and the specific requirements of your project. Whether you prefer the simplicity of the modulus operator or the bitwise AND operator, each method achieves the same goal of determining whether a number is odd or even in JavaScript.