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Simple JavaScript Calculator
Instructions:

1. Open your preferred code editor or browser-based environment, such as JSFiddle or CodePen.

2. Create an HTML file and include the necessary tags for a basic HTML structure (<!DOCTYPE>, <html>, <head>, <body>). Add a <script> tag inside the <head> or at the end of the <body> to write your JavaScript code.

3. In the JavaScript section, declare the following variables:

num1: A number variable to store the first operand.
num2: A number variable to store the second operand.
operation: A string variable to store the chosen operation (addition, subtraction, multiplication, or division).
result: A number variable to store the result of the operation.

4. Write a function called performOperation that takes num1, num2, and operation as arguments. This function should perform the specified operation using a conditional statement (e.g., if-else or switch statement) and return the result.

5. Test your performOperation function with different values for num1, num2, and operation. For example:

num1 = 5, num2 = 3, operation = "add" should return 8.
num1 = 7, num2 = 2, operation = "subtract" should return 5.
num1 = 3, num2 = 4, operation = "multiply" should return 12.
num1 = 10, num2 = 2, operation = "divide" should return 5.

6. Display the result of each test case using console.log() or by appending the result to the HTML document using DOM manipulation.

7. (Optional) Create a simple user interface with input fields and buttons to allo