 # JavaScript: Reverse the order of the bits in a given integer

## JavaScript Basic: Exercise-127 with Solution

Write a JavaScript program to reverse the order of the bits in a given integer.

56 -> 111000 after reverse 7 -> 111
234 -> 11101010 after reverse 87 -> 1010111

Pictorial Presentation: Sample Solution:

HTML Code:

``````<!DOCTYPE html>
<html>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width">
<title> Reverse the order of the bits in a given integer</title>
<body>

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

JavaScript Code:

``````function mirror_bits(n) {
return parseInt(n.toString(2).split("").reverse().join(""), 2);
}

console.log(mirror_bits(56));
console.log(mirror_bits(234));
``````

Sample Output:

```7
87
```

Flowchart: ES6 Version:

``````function mirror_bits(n) {
return parseInt(n.toString(2).split("").reverse().join(""), 2);
}

console.log(mirror_bits(56));
console.log(mirror_bits(234));
``````

Live Demo:

See the Pen javascript-basic-exercise-127 by w3resource (@w3resource) on CodePen.

Improve this sample solution and post your code through Disqus

What is the difficulty level of this exercise?

Test your Programming skills with w3resource's quiz.

﻿

## 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
```