w3resource

JavaScript: Reverse the elements of a given array of integers length 3

JavaScript Basic: Exercise-73 with Solution

Write a JavaScript program to reverse the elements of a given array of integers length 3.

Pictorial Presentation:

JavaScript: Reverse the elements of a given array of integers 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 reverse the elements of a given array of integers length 3.</title>
</head>
<body>

</body>
</html>

JavaScript Code:

function reverse3(array) {
    return array.map((element, idx, arr) => arr[(arr.length - 1) - idx]);
}

console.log(reverse3([5, 4, 3])); 
console.log(reverse3([1, 0, -1]));  
console.log(reverse3([2, 3, 1]));

Sample Output:

[3,4,5]
[-1,0,1]
[1,3,2]

Flowchart:

Flowchart: JavaScript - Reverse the elements of a given array of integers length 3

ES6 Version:

function reverse3(array) {
    return array.map((element, idx, arr) => arr[(arr.length - 1) - idx]);
}

console.log(reverse3([5, 4, 3])); 
console.log(reverse3([1, 0, -1]));  
console.log(reverse3([2, 3, 1]));

Live Demo:

See the Pen JavaScript - Reverse the elements of a given array of integers length 3 - basic-ex-73 by w3resource (@w3resource) on CodePen.


Contribute your code and comments through Disqus.

Previous: Write a JavaScript program to check if the first and last elements are equal of a given array of integers length 3.
Next: Write a JavaScript program to find the larger value between the first or last and set all the other elements with that value.

What is the difficulty level of this exercise?

Test your Programming skills with w3resource's quiz.



Share this Tutorial / Exercise on : Facebook and Twitter

JavaScript: Tips of the Day

Returns the sum of the powers of all the numbers from start to end (both inclusive)

Example:

const sumPower = (end, power = 2, start = 1) =>
  Array(end + 1 - start)
    .fill(0)
    .map((x, i) => (i + start) ** power)
    .reduce((a, b) => a + b, 0);
console.log(sumPower(10)); // 385
console.log(sumPower(10, 3)); // 3025
console.log(sumPower(10, 3, 5)); // 2925 

Output:

385
3025
2925