Power digit sum help

JavaScript
1

How can i convert exponential to number ? :thinking:


function powerDigitSum(exponent) {
let num = Math.pow(2,exponent);
let arr = num.toString().split('');
return arr.map(numm => Number(numm)).reduce((number, total) => number+total, 0);

}

powerDigitSum(15);

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Challenge: Problem 16: Power digit sum

Link to the challenge:

2

What do you mean exponential to number?

3

Try this,

 let num = BigInt(Math.pow(2, exponent)
 let arr = num.toString().split('');
 //Now use .slice() to delete n from the Array
  arr.slice(arr.length - 1)
 // Mapping is not necessary
  return arr.reduce((number, total) => number+total,);
4

It is great that you solved the challenge, but instead of posting your full working solution, it is best to stay focused on answering the original poster’s question(s) and help guide them with hints and suggestions to solve their own issues with the challenge.

We are trying to cut back on the number of spoiler solutions found on the forum and instead focus on helping other campers with their questions and definitely not posting full working solutions.

You can post solutions that invite discussion (like asking how the solution works, or asking about certain parts of the solution). But please don’t just post your solution for the sake of sharing it.
If you post a full passing solution to a challenge and have questions about it, please surround it with [spoiler] and [/spoiler] tags on the line above and below your solution code.

5

Message received, Won’t happen again.