Reverse string in Javascript using recursion

I'll start with using inbuilt functions split(), reverse(), join().

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

//Driver code
let word = "hello";
reverseString(word)

Also, you could even use FOR loop to reverse the string which I am not going to show here.

Using recursion

function reverseString(word) {
	
	//Base code
  if(word.length == 0) return "";

	return reverseString(word.substr(1)) + word.charAt(0);
  
}

//Driver code
let word = "hello";
reverseString(word)

//Time Complexity: O(n)

Here, you can see that we're using substr to trim the word for recurring calls.

Check the difference between Recursion and Iteration from here