 # JavaScript: Compute the sum of three elements of a given array of integers of length 3

## JavaScript Basic: Exercise-69 with Solution

Write a JavaScript program to compute the sum of three elements of a given array of integers of length 3.

Pictorial Presentation: Sample Solution:

HTML Code:

``````<!DOCTYPE html>
<html>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width">
<title>JavaScript program to compute the sum of three elements of an given integers of length 3.</title>
<body>

</body>
</html>
```
```

JavaScript Code:

``````function sum_three(nums)
{
return nums + nums + nums;
}

console.log(sum_three([10, 32, 20]));
console.log(sum_three([5, 7, 9]));
console.log(sum_three([0, 8, -11]));
```
```

Sample Output:

```62
21
-3
```

Flowchart: ES6 Version:

``````function sum_three(nums)
{
return nums + nums + nums;
}

console.log(sum_three([10, 32, 20]));
console.log(sum_three([5, 7, 9]));
console.log(sum_three([0, 8, -11]));
``````

Live Demo:

See the Pen JavaScript - compute the sum of three elements of a given array of integers of length 3 - basic-ex-69 by w3resource (@w3resource) on CodePen.

What is the difficulty level of this exercise?

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## JavaScript: Tips of the Day

Parameter's value

```function getItems(fruitList, ...args, favoriteFruit) {
return [...fruitList, ...args, favoriteFruit]
}

getItems(["banana", "apple"], "pear", "orange")
```

...args is a rest parameter. The rest parameter's value is an array containing all remaining arguments, and can only be the last parameter! In this example, the rest parameter was the second parameter. This is not possible, and will throw a syntax error.

```function getItems(fruitList, favoriteFruit, ...args) {
return [...fruitList, ...args, favoriteFruit];
}

getItems(['banana', 'apple'], 'pear', 'orange');```
The above example works. This returns the array [ 'banana', 'apple', 'orange', 'pear' ].

Ref: https://bit.ly/3jFRBje