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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:

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

Sample Solution:

HTML Code:

<!DOCTYPE html>
<html>
<head>
  <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>
</head>
<body>

</body>
</html>

JavaScript Code:

function sum_three(nums)
{
  return nums[0] + nums[1] + nums[2];
}

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:

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

ES6 Version:

function sum_three(nums)
{
  return nums[0] + nums[1] + nums[2];
}

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.


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Previous: Write a JavaScript program to create a new string taking the first and last n characters from a given string.
Next: Write a JavaScript program to rotate the elements left of a given array of integers of length 3.

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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