How to use Split() Reverse() and Join() Methods In Javascript
In this approach, we start by splitting the input string into an array of words using the space delimiter. Then, we iterate through each word in the array. For each word, we check if its length is odd. If it is odd, we reverse the characters of the word using the split, reverse, and join() operations. Finally, we join the array of words back into a string and return the modified string.
Example: The below code example shows the usage of Split, Reverse, and Join to Reverse only the odd-length words
function reverseOWords(str) {
// Split the string into an array of words
let words = str.split(" ");
// Iterate through each word
for (let i = 0; i < words.length; i++) {
// Check if the length of the word is odd
if (words[i].length % 2 !== 0) {
words[i] = words[i].split("")
.reverse().join("");
}
}
return words.join(" ");
}
const input = "Hellow world how are you?";
console.log("Output:", reverseOWords(input));
Output
Output: Hellow dlrow woh era you?
Time complexity: O(n)
Space complexity: O(n)
Reverse Only the Odd Length Words using JavaScript
Given a string containing words separated by spaces, our task is to reverse only the words with an odd length. The rest of the words remain unchanged.
Example:
Input: Hellow world how are you? Output: Hellow dlrow woh era you?
Below are the approaches to Reverse only the odd-length words:
Table of Content
- Using Split() Reverse() and Join() Methods
- Using In-place Reversal and split() method