Can map be used in strings? Do I have to split a string in order to search and replace elements from it?

Question

const htmlEntities = {
"&": "&amp;", "<": "&lt;", ">": "&gt;", '"': "&quot;", "'": "&apos;"
};
For example I want to use this object in order to replace these symbols with their code from the word the user enters

Answer 1

No you don't have to use split to find and replace you can use the String method .replace()
https://www.w3schools.com/jsref/jsref_replace.asp

Answer 2

map method can only be used on arrays. But split returns you an array.

Answer 3

Answer to second question?