How to find exclusive OR in javascript

JavaScript is a commonly used programming language that provides many methods for manipulating data, one of which is exclusive OR (XOR). XOR is a logical operator used to compare two binary digits. If the two digits are different, the result is 1, otherwise it is 0. In this article, we will explore how to use the XOR operation in JavaScript.

1.Basic syntax

In JavaScript, the XOR operator is represented by the symbol "^". For example, the following code will perform an XOR operation on two variables num1 and num2:

let num1 = 10;
let num2 = 5;
let result = num1 ^ num2;
console .log(result);

In this example, the values ​​of num1 and num2 are 10 and 5 respectively. When they are XORed, the result is 15. Therefore, the result will be stored in a new variable named result and output to the console through the console.log() function.

2. How to use the XOR operation

The XOR operation can be used for many different operations. Here are some of the most common uses:

2.1. Swap the value of a variable

In previous code examples, we have seen how to use the XOR operator to encrypt two numbers. However, the XOR operation can also be used to exchange the values ​​of two variables. Here is the code to implement this method:

let a = 10;
let b = 20;
a = a ^ b;
b = a ^ b;
a = a ^ b;

In this example, we use three XOR operations to realize the exchange of variable a and variable b. First, XOR a and b and store the result in a. Then, XOR a with b and store the result in b. Finally, XOR operation is performed on a and b, and the result is stored in a. After executing this code, the value of variable a will become 20 and the value of variable b will become 10.

2.2. Check parity

Use the XOR operation to check the parity of a number. If the last bit of a number is 0, it is even. Otherwise, it is an odd number. Here is the code that uses XOR operation to check parity:

function isEven(num) {
return (num ^ 1) == num 1;
}

at In this example, we define a function called isEven() to check the parity of a number. The function takes one parameter num which is the number we want to check. We XOR num with 1 and compare the result with num 1. If they are the same, then num is an even number. Otherwise, it is an odd number.

2.3.Character encryption

Using XOR operation, strings can be encrypted and decrypted. The following is an example:

function encrypt(str, key) {
let result = "";
for (let i = 0; i < str.length; i ) {

result += String.fromCharCode(str.charCodeAt(i) ^ key.charCodeAt(i % key.length));

}
return result;
}

In this example, we define a function named encrypt() to encrypt a string. This function takes two parameters: str is the string we want to encrypt, and key is the encryption key. The function uses a for loop to XOR each character in the string. We use the String.fromCharCode() function to convert the result to a character and add it to a new string called result. Finally, the encrypted string is returned to the caller.

3. Summary

The XOR operation is a very useful logical operator, and it is also widely used in JavaScript. This article discusses how to use the XOR operator in JavaScript to perform a variety of different operations, including encrypting numbers, swapping variables, checking parity, and encrypting strings. Mastering this knowledge will help you develop more efficient and secure JavaScript code.

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