# Nearest power 2 of a number - JavaScript

JavascriptWeb DevelopmentFront End TechnologyObject Oriented Programming

We are required to write a JavaScript function that takes in a number and returns a number that can be represented as a power of 2 which is nearest to the input number.

For example −

If the input number if 365, then the output should be 256, because 256 is the nearest such number to 365 which can be represented as 2^n for some whole number value of n.

## Example

Let’s write the code for this function −

const num = 365;
const nearestPowerOfTwo = num => {
// dealing only with non-negative numbers
if(num < 0){
num *= -1;
}
let base = 1;
while(base < num){
if(num - base < Math.floor(base / 2)){
return base;
};
base *= 2;
};
return base;
};
console.log(nearestPowerOfTwo(num));

## Output

The output in the console: −

256
Published on 15-Sep-2020 11:23:47