Easy to read and understand compared to the other solutions though it will have overall time complexity is O(n).

nice you are now 4kyu !!!! asking make you more smarter!

Best solution, imho

Js array split and join method both use for loops underneath the hood making your solution have a time complexity of O(n + m) but solving in string without converting to array the for loop runs only once and gives a better solutions with O(n) time complexity.

Same problem.