# LeetCode: Count Integers With Even Digit Sum Solution

*Map and filter*

## Approach

Populate new array with digit sum

Filter even elements

## Implementation

1var countEven = function (num) {2 const digitSum = num =>3 num4 .toString()5 .split("")6 .map(Number)7 .reduce((acc, el) => acc + el, 0)89 const isEven = num => num % 2 === 01011 return Array.from({ length: num }, (_, i) => i + 1)12 .map(digitSum)13 .filter(isEven).length14}

## References

## Similar problems

Sum of Numbers With Units Digit K

Sum of Digits of String After Convert

Number of Ways to Buy Pens and Pencils

## Comments

Loading comments...

## Tags

leetcode

math

string

array

## Apply and earn a $2,500 bonus once you're hired on your first job!

Clients from the Fortune 500 to Silicon Valley startups

Choose your own rate, get paid on time

From hourly, part-time, to full-time positions

Flexible remote working environment

A lot of open JavaScript jobs!!

**Fact corner:** Referred talent are 5x more likely to pass the Toptal screening process than the average applicant.

**Still hesitate?** Read HoningJS author's guide on dealing with Toptal interview process.