How Can I Reverse a String in JavaScript Without Using Built-in Functions?

How do you reverse a string in-place using pure code in JavaScript?

Reversing a string can prove challenging if you want to avoid using built-in functions like .reverse() and .charAt(). Here's a comprehensive solution without relying on these functions:

ASCII-Aware Reversal

If you're working with ASCII characters, you can leverage the following approach:

function reverse(s) {
  return s.split("").reverse().join("");
}

Unicode-Aware Reversal

For UTF-16 or other multi-byte characters, consider the following:

• Using the array expansion operator:

  function reverse(s) {
  return [...s].reverse().join("");
  }

• Utilizing a Unicode-aware regular expression with split():

  function reverse(s) {
  return s.split(/(?:)/u).reverse().join("");
  }

  These solutions allow you to reverse a string in-place without using built-in functions, making your code more explicit and efficient.

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