# JavaScript - Next power of two of a given number

## JavaScript Bit Manipulation: Exercise-4 with Solution

Write a JavaScript program to find next power of two of a given number.

A power of two is a number of the form 2n where n is an integer, that is, the result of exponentiation with number two as the base and integer n as the exponent.

The first ten powers of 2 for non-negative values of n are: 1, 2, 4, 8, 16, 32, 64, 128, 256, 512, ...

**Test Data:**

(1) -> 1

(4) -> 4

(9) -> 16

("15") -> "It must be number!"

**Sample Solution: **

**JavaScript Code:**

```
const next_Power_Of_Two = (num) => {
if (typeof num != "number") {
return 'It must be number!'
}
if (num > 0 && (num & (num - 1)) === 0)
return num
let result = 1
while (num > 0)
{
result = result << 1
num = num >> 1
}
return result
}
console.log(next_Power_Of_Two(1))
console.log(next_Power_Of_Two(4))
console.log(next_Power_Of_Two(9))
console.log(next_Power_Of_Two("15"))
```

Sample Output:

1 4 16 It must be number!

**Flowchart: **

**Live Demo: **

See the Pen javascript-bit-manipulation-exercise-4 by w3resource (@w3resource) on CodePen.

* To run the code mouse over on Result panel and click on 'RERUN' button.*

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## JavaScript: Tips of the Day

**Creates an object composed of the properties the given function returns truthy for. The function is invoked with two arguments: (value, key)**

Example:

const tips_composed = (obj, fn) => Object.keys(obj) .filter(k => fn(obj[k], k)) .reduce((acc, key) => ((acc[key] = obj[key]), acc), {}); console.log(tips_composed({ p: 2, q: '4', r: 6 }, x => typeof x === 'number'));

Output:

[object Object] { p: 2, r: 6 }

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