How do you reverse a string in place in JavaScript?

Question

How do you reverse a string in place (or in-place) in JavaScript when it is passed to a function with a return statement, without using built-in functions (.reverse()<

Answer 1

During an interview, I was asked to reverse a string without using any variables or native methods. This is my favorite implementation:

function reverseString(str) {
    return str === '' ? '' : reverseString(str.slice(1)) + str[0];
}