1563416073
Reverse a String in JavaScript and Solutions
The reverse a string problem is a common algorithm problem. In this article, we will consider four JavaScript solutions to it.
A Little Background Info
Lately, I have been taking a course on data structures and algorithms. This is because I realized that I suck at it. This has not always been the case. When I started learning JavaScript, solving algorithm challenges was the fun part for me. I could stay up for hours late at night just trying to solve a challenge. But two years and many frontend projects later, it seems I've forgotten everything I learned. That is why I decided to go back to learn and practice.
Solid knowledge of data structures and algorithms comes with much practice. And what better way to remember what I learn that to write about it. That's why I am presenting to you the first part of a series of articles to come.
Let's delve into our algorithm challenge for today: Reversing a String
The Problem
Reversing a string is, well, reversing a string. Okay, here's the problem statement: Write a function that reverses a string. If you pass "Sarah" to the function, it should return "haraS" and "listen" should become "netsil". Got it?
Now, let's look at four javascript solutions.
Solution 1. Using the array reverse() method
Thanks to the Array.reverse() method, we can reverse an array without much stress. The reverse() method reverses an array in place. The first array element becomes the last, and the last array element becomes the first.
In our case though, we are working with strings. So this means that we have to convert the string to an array using the split method, reverse it using the reverse method and convert it back to a string using the join method. Here's the code example.
function reverseString(string) {
//convert the string to an array
let array = string.split("");
//Use the reverse method
array.reverse()
//Convert it back to a string and return
return array.join("")
}
We can convert this to a one-liner using arrow function and implicit return.
const reverseString = (string) => string.split(“”).reverse().join(‘’);
That’s it. One line of goodness. Let’s move to the next solution.
Solution 2: Good Ol’ For-loop
This is the classic example of reversing through a string. It might be one of the first methods that will come to your mind if you encounter this problem.
What we will do here is to create an empty string that will hold the reversed string, loop through each character in the string and append it to the beginning of the new string.
function reverse(str) {
let reverseString = “”;
for (let character of str) {
reverseString = character + reverseString;
}
return reverseString
}
Solution 3 - Using the Array.reduce() method
The reduce() method executes a reducer function (that you provide) on each element of the array, resulting in single output value. You can read about it, if you are not familiar with it.
To use the reduce method, we need to convert our string to an array. Next, we use the reduce method to convert it to a reversed string. The reducer, in this case, appends each character of the string to the beginning of the accumulator which, in the code below, is reversed.
function reverseString(string) {
//convert the string to an array
const array = string.split(‘’);
//use the reduce method to convert the array to a reversed string
const reversedString = array.reduce((reversed, character) => {
return character + reversed
}, '')
return reversedString
}
This function above can further be reduced to :
const reverseString = (string) => {
return string.split(‘’).reduce((reversed, character) => character + reversed, ‘’)
}
Making it a one-liner and shortening the name of the variables used in the reduce method.
const reverseString = (string) => string.split(‘’).reduce((rev, char) => char + rev, ‘’)
Solution 4 - Using recursion
Are you a friend of recursion? If not, let me introduce you to it.
Recursion is a way of solving a problem by using a function that calls itself. Each time the function calls itself, it reduces the problem into subproblems. This recursive call continues until a point is reached where the subproblem can be called without further recursion.
An important part of a recursive function is a base case. This is the condition(s) where the recursive call terminates to ensure it does not result in an infinite loop.
Let’s get back to ‘reversing a string’. In this case, our base case is when the string is empty. We use the string.substring() method to get remove the first character in the string and pass the other characters to the function. Then we append the first character to our return statement as seen in the code below.
function reverse(string){
//base case: if str is empty return str
if(string === “”){
return string
} else{
return reverse(string.substring(1)) + string[0]
}
}
We can use a ternary operator instead of if-else statements.
function reverse(string){
return string ? reverse(string.substring(1)) + string[0] : string
}
Conclusion
So there you have it, four cools ways to reverse a string in JavaScript. Have any other solution to this problem, please share it in the comments. I would really love to know.
Thanks for reading. If you liked this post, share it with all of your programming buddies!
Further reading
☞ Svelte.js - The Complete Guide
☞ The Complete JavaScript Course 2019: Build Real Projects!
☞ Become a JavaScript developer - Learn (React, Node,Angular)
☞ JavaScript: Understanding the Weird Parts
☞ Vue JS 2 - The Complete Guide (incl. Vue Router & Vuex)
☞ The Full JavaScript & ES6 Tutorial - (including ES7 & React)
☞ JavaScript - Step By Step Guide For Beginners
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JavaScript Strings Tutorial
JavaScript Strings
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What is JavaScript - Stackfindover - Blog
Who invented JavaScript, how it works, as we have given information about Programming language in our previous article ( What is PHP ), but today we will talk about what is JavaScript, why JavaScript is used The Answers to all such questions and much other information about JavaScript, you are going to get here today. Hope this information will work for you.
Who invented JavaScript?
JavaScript language was invented by Brendan Eich in 1995. JavaScript is inspired by Java Programming Language. The first name of JavaScript was Mocha which was named by Marc Andreessen, Marc Andreessen is the founder of Netscape and in the same year Mocha was renamed LiveScript, and later in December 1995, it was renamed JavaScript which is still in trend.
What is JavaScript?
JavaScript is a client-side scripting language used with HTML (Hypertext Markup Language). JavaScript is an Interpreted / Oriented language called JS in programming language JavaScript code can be run on any normal web browser. To run the code of JavaScript, we have to enable JavaScript of Web Browser. But some web browsers already have JavaScript enabled.
Today almost all websites are using it as web technology, mind is that there is maximum scope in JavaScript in the coming time, so if you want to become a programmer, then you can be very beneficial to learn JavaScript.
JavaScript Hello World Program
In JavaScript, ‘document.write‘ is used to represent a string on a browser.
<script type="text/javascript">
document.write("Hello World!");
</script>
How to comment JavaScript code?
- For single line comment in JavaScript we have to use // (double slashes)
- For multiple line comments we have to use / * – – * /
<script type="text/javascript">
//single line comment
/* document.write("Hello"); */
</script>
Advantages and Disadvantages of JavaScript
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Hire Dedicated JavaScript Developers -Hire JavaScript Developers
It is said that a digital resource a business has must be interactive in nature, so the website or the business app should be interactive. How do you make the app interactive? With the use of JavaScript.
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The essential JavaScript concepts that you should understand
As a JavaScript developer of any level, you need to understand its foundational concepts and some of the new ideas that help us developing code. In this article, we are going to review 16 basic concepts. So without further ado, let’s get to it.
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