How To Reverse A String in JavaScript

How To Reverse A String in JavaScript

The reverse function is very important in programming and data structure programs. The reverse function is often used in any programming to reverse the order of elements in a sequence, such as an array, list, or string. This can be useful for various operations, such as sorting, searching, or displaying the elements in a different order. If you are wondering how to reverse a string in JavaScript then this blog article is for you.

It can also be used in implementing certain mathematical concepts, such as palindromes, where it is necessary to compare the order of characters in a string. Additionally, a built-in reverse function can be more efficient, as it may be optimized for the specific programming language or data structure.

If you are a programmer, you should also know about the reverse function and “How To Reverse A String in JavaScript.”  if you know, it’s very good. If not, don’t worry because we will help you know about that.

This article will discuss “How To Reverse A String in JavaScript.” Please continue with us. Let’s start.

You can also take JavaScript assignment help to learn more about this topic.

What is Reverse a String?

Reversing a string means reading it from end to beginning and producing a new string with the characters in the opposite order. For example, reversing the string “Hello” would result in “olleH.” 

Reversing a string can be achieved in various programming languages using different techniques, such as loops, in-built functions, or converting the string into arrays and then manipulating them.

How To Reverse A String in JavaScript

There are multiple methods to reverse a string in JavaScript. We are below mention: 

  1. split(), reverse(), and join() methods
  2. for-loop method
  3. reduce() method
  4. Recursion method 

split(), reverse(), and join() method

The reverse() method in JavaScript is used to reverse the order of elements in an array. It modifies the original array and returns the reversed array. To reverse a string in JavaScript using the reverse() method, we can first convert the string into an array of characters using the split(”) method, then use the reverse() method to reverse the order of elements in the array, and finally, join the reversed array back into a string using the join(”) method.

Example of split(), reverse(), and join() methods to Reverse A string in JavaScript 

Program

let string = " WILLIAMS World";
 
let chars = string.split('');
 
let reversedChars = chars.reverse();
 
let reversedString = reversedChars.join('');
 
console.log(reversedString); 

Output

dlroW SMAILLIW

Snapshot for program

Output

In this example, we first convert the string “WILLIAMS World” into an array of characters [“W”, “I”, “L”, “L”, “I,”” A”,” M”,”S”,” “, “W”, “o”, “r”, “l”, “d”] using the split(”) method. Then, we use the reverse() method to reverse the order of elements in the array, resulting in [“d”, “l”, “r”, “o”, “W”, ” “, “S”, “M”, “A”, “I”, “L”, “L”, “I”, “W”]. Finally, we join the reversed array back into a string using the join(”) method, resulting in the string “dlroW SMAILLIW “.

for-loop method

To reverse a string in JavaScript using a for-loop, you can create a new empty string, then loop through the original string starting from the end and add each character to the new string. Finally, return the new string.

Also read: Enhanced For Loop Java

Example of the for-loop method to Reverse A string in JavaScript 

Program


function reverseString(str) {
    let reversed = "";
 
    for (let i = str.length - 1; i >= 0; i--) {
      reversed += str[i];
    }
 
    return reversed;
  }
 
  const originalString = "9876543210";
  const reversedString = reverseString(originalString);
 
  console.log(reversedString);

Output

0123456789

Snapshot of Program

Output

This function takes in a string str as an argument and returns the reversed string. The for-loop starts from the end of the string (str.length – 1) and decrements i by 1 until it reaches 0. For each iteration, the current character (str[i]) is added to the reversed string.

reduce() method

You can use the reduce() method in JavaScript to reverse a string by applying the sequence operation on each character of the string, starting from the last character and going toward the first character. Here’s an example:

Example of the reduce() method to Reverse A string in JavaScript 

Program

const reverseString = (str) => 

str.split('').reduce((rev, char) => char + rev, '');

console.log(reverseString("practice makes a man perfect"));

Output

tcefrep nam a sekam ecitcarp

Snapshot of program

Output

In this example, str.split(”) is used to split the string into an array of characters, and reduce() is used to iterate over the array and sequence each character in reverse order. The rev argument stores the result of each sequence, and the char argument provides the current character being processed.

Using the Recursion method Reverse A String in JavaScript.

Recursion is a technique in programming where a function calls itself to complete a task. It can solve problems by breaking them down into smaller, simpler subproblems and recursively solving those subproblems. In JavaScript, you can use recursion to reverse a string by breaking it down into smaller substrings and concatenating them in reverse order.

Example of the Recursion() method to Reverse A string in JavaScript 

Program

function reverseString(str) {

    if (str === '') {

      return '';

    } else {

      return reverseString(str.substr(1)) + str.charAt(0);

    }

  }

  let originalString = "canada";

  let reversedString = reverseString(originalString);

  console.log(reversedString);

Output

adanac

In this example, the function reverseString takes a string as an argument and reverses it using recursion. If the input string is empty, the function returns an empty string. If the input string is not empty, the function returns a reversed string by calling itself with the substring of the input string starting from the second character and concatenating the first character of the input string to the end of the result.

Snapshot for Program

Output

We have done this from our side.

Conclusion

In this article, we have discussed “How To Reverse A String in JavaScript.” Reduce, recursion, and other methods is a powerful technique in computer science that allows us to simplify the logic in solving specific problems. Above example, we have shown how to reverse a string using the recursive method in JavaScript, and you can also apply this technique to many other problems.