The spread statement in function **calls** is **syntactically** identical to the rest statement in definitions, but does the **opposite**. Let's take the `sum()`

function as an example:

```
const sum = (...numbers) => {
let result = 0;
for (let num of numbers) {
result += num;
}
return result;
};
```

Let's call `sum()`

by applying the spread statement to an array of arguments:

```
const numbers = [1, 7, 4];
sum(...numbers); // 12
```

The spread statement decomposes the array into arguments. The number of arguments received by the spread statement is equal to the number of array elements. In essence, the code above is converted into a call:

```
sum(numbers[0], numbers[1], numbers[2]);
// sum(1, 7, 4);
```

As with function definitions, the spread operator can be used in conjunction with positional arguments:

```
const numbers = [1, 7, 4];
sum(8, ...numbers); // 20
sum(8, 10, ...numbers); // 30
sum(8, 10, 70, ...numbers); // 100
```

Unlike the rest-operator in the definition of functions, the spread-operator does not have to be last, it can be in any position:

```
const numbers = [1, 7, 4];
sum(8, 10, ...numbers); // 30
sum(8, ...numbers, 10); // 30
sum(...numbers, 8, 10); // 30
```

Moreover, there can be any number of spread operators and in any order:

```
const numbers1 = [1, 7, 4];
const numbers2 = [5, 5];
// sum(1, 7, 4, 5, 5);
sum(...numbers1, ...numbers2); // 22
// sum(5, 5, 1, 7, 4);
sum(...numbers2, ...numbers1); // 22
// sum(8, 1, 7, 4, 10, 5, 5);
sum(8, ...numbers1, 10, ...numbers2); // 40
```

## Are there any more questions? Ask them in the Discussion section.

The Hexlet support team or other students will answer you.

- Article “How to Learn and Cope with Negative Thoughts“
- Article “Learning Traps“
- Article “Complex and simple programming tasks“

## For full access to the course you need a professional subscription.

A professional subscription will give you full access to all Hexlet courses, projects and lifetime access to the theory of lessons learned. You can cancel your subscription at any time.