JavaScript(JS) JS make a simple calculator

Here's an example of a simple calculator in JavaScript that can perform addition, subtraction, multiplication, and division:

// Function to perform the calculation
function calculate(num1, operator, num2) {
  let result;

  switch(operator) {
    case '+':
      result = num1 + num2;
      break;
    case '-':
      result = num1 - num2;
      break;
    case '*':
      result = num1 * num2;
      break;
    case '/':
      result = num1 / num2;
      break;
    default:
      return "Invalid operator";
  }

  return result;
}

// Prompt the user for input
const num1 = parseFloat(prompt("Enter the first number:"));
const operator = prompt("Enter an operator (+, -, *, /):");
const num2 = parseFloat(prompt("Enter the second number:"));

// Perform the calculation and display the result
const result = calculate(num1, operator, num2);
console.log(`The result is: ${result}`);

In this code, we first define a calculate function that takes in three arguments: num1, operator, and num2. The function uses a switch statement to determine which operation to perform based on the operator argument, and then returns the result of the calculation.

We then prompt the user to enter the first number, operator, and second number using prompt(). We parse the input as floats using parseFloat() to ensure that we can perform mathematical operations on them.

Finally, we call the calculate function with the user input and store the result in a variable. We then log the result to the console using console.log().