How to solve in javascript

Question

2. Replacing the vowels
// Input : hello
// Output : holle
// Input : hello world
// Output : hollo werld

Answer 1

You haven't described how the output comes to be, what condition and/or restriction applies.

And your code in attempt to solve it ...

Answer 2

About the attempt: pls edit your question description and include a link to your code in Code Playground.
Also, while editting your question description, pls elaborate on the rules to replace vowels.