How Can I Reverse a String in JavaScript In-Place Using Only Built-In Functions While Handling Unicode Correctly?

Reverse a String In-Place in JavaScript Using Built-In Functions

Problem:

Consider a string passed to a function that returns the reversed string. How can this be achieved in JavaScript using built-in functions and without relying on methods like .reverse() or .charAt()?

Solution:

Unicode-Aware Solution:

For strings containing simple ASCII characters, the following function utilizes built-in functions:

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

However, for strings containing multi-byte characters (such as UTF-16), this solution will return invalid unicode strings or strings that appear distorted. To address this, consider the following alternative approaches:

Using Array Expansion Operator:

The array expansion operator is Unicode-aware, allowing for the following reversal function:

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

Using Split() with RegExp and Unicode Flag:

Another Unicode-aware approach is to use split() with a regular expression and the Unicode flag (u) as the separator:

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

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