The concatenation operator in JavaScript is the plus sign `+`. When used with `strings`, the `+` operator concatenates, or combines, the two strings together into a single string.

For example:

```javascript
const firstName = 'John';
const helloMessage = 'Hello, ' + firstName + '!';

console.log(helloMessage); // Hello, John!
```

In this example, we're using the concatenation operator to combine the strings `Hello, ` and `!` with the value of the `firstName` variable.

---

When used with `numbers`, the `+` operator adds the two numbers together.

For example:

```javascript
const num1 = 5;
const num2 = 10;
const result = num1 + num2;

console.log(result); // 15
```

In this example, we're using the `+` operator to add the values of the `num1` and `num2` variables together.

---

When used with `strings` and `numbers`, the `+` operator converts the number to a string and then concatenates the two strings together.

For example:

```javascript
const num = 5;
const message = 'The number is ' + num;

console.log(message); // The number is 5
```

In this example, we're using the `+` operator to convert the value of the `num` variable to a string and then concatenate it with the string `The number is `.

---

In the exercise below, you'll be using the `+` operator to combine strings and numbers.

You'll be given a variable called `x` and a variable called `y` with random numbers. You'll also be given a variable called `message`. Your job is to use the `+` operator to combine the `x` and `y` variables together and assign the result to the `message` variable with a string that says `"The sum of x and y is z"`.

Example:

```javascript
const x = 5;
const y = 10;
// Your code here
let message = '';

console.log(message);
// The expected output is
// "The sum of 5 and 10 is 15"
```











Concatenation Operator