Codewars 8 Kyu Regex Count Lowercase Letters Javascript

Summary

this one uses the match() method and this one uses the split() and filter methods with using the test() method and this to check if it's a single digit. this one uses the toUpperCase() and toLowerCase() methods kata link: ... some Number() construction with a lot of test() kata link: this one uses slice() and toUpperCase() this one uses a for loop, the replace() method, and more kata link: ... we use the reduce() method in this one reduce() info: ... Code along with me as we solve 'Simple validation of a username with this one uses double for loops, the replace() method, and more kata link: ...