Here’s an example of how you can create a basic calculator in JavaScript using the sample code:

```
function calculate(num1, num2, operator) {
switch (operator) {
case "+":
return num1 + num2;
break;
case "-":
return num1 - num2;
break;
case "*":
return num1 * num2;
break;
case "/":
return num1 / num2;
break;
default:
return "Invalid operator";
}
}
```

In this example, the function `calculate`

takes three parameters: `num1`

, `num2`

, and `operator`

. The `switch`

statement is used to determine the operation to perform based on the value of `operator`

. If `operator`

is `"+"`

, the function returns the sum of `num1`

and `num2`

. If `operator`

is `"-"`

, the function returns the difference of `num1`

and `num2`

, and so on. If the value of `operator`

doesn’t match any of the cases, the function returns an error message `"Invalid operator"`

.

You can call the `calculate`

function and pass in the values for the parameters:

```
let result = calculate(10, 5, "+");
console.log(result); // Output: 15
```

In this example, `result`

will store the value returned by the `calculate`

function when it is called with `num1`

equal to `10`

, `num2`

equal to `5`

, and `operator`

equal to `"+"`

. The value of `result`

will then be logged to the console, which will display `15`

.

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