Skip to content
geeksforgeeks
  • Tutorials
    • Python
    • Java
    • Data Structures & Algorithms
    • ML & Data Science
    • Interview Corner
    • Programming Languages
    • Web Development
    • CS Subjects
    • DevOps And Linux
    • Software and Tools
    • School Learning
    • Practice Coding Problems
  • Go Premium
  • JS Tutorial
  • JS Exercise
  • JS Interview Questions
  • JS Array
  • JS String
  • JS Object
  • JS Operator
  • JS Date
  • JS Error
  • JS Projects
  • JS Set
  • JS Map
  • JS RegExp
  • JS Math
  • JS Number
  • JS Boolean
  • JS Examples
  • JS Free JS Course
  • JS A to Z Guide
  • JS Formatter
Open In App
Next Article:
JavaScript Coding Questions and Answers
Next article icon

Interesting Facts About JavaScript Strings

Last Updated : 23 Jul, 2025
Comments
Improve
Suggest changes
Like Article
Like
Report

Let's see some interesting facts about JavaScript strings that can help you become an efficient programmer.

Strings are Immutable

In JavaScript, strings are immutable, which means once you create a string, you cannot change its characters individually. Any operation that appears to modify a string, like replace() or concat(), actually creates a new string.

JavaScript
let s = "hello";
s[0] = "H";  // Won't work
console.log(s);  // Still "hello"

Output

"hello"

Using Template Literals

Template literals, introduced in ES6, allow for writing expressions directly into strings using backticks ` and ${} syntax.

JavaScript
let s1 = "Sourav";
let s2 = `Hi, ${a}!`;
console.log(s2);

Output

"Hi, Sourav!"

String Comparison

JavaScript compares strings letter by letter. This makes JavaScript strings different from some languages that use locale-based comparisons.

JavaScript
console.log("apple" > "banana");  

Output

false

Strings as Arrays of Characters

We can access JavaScript strings just like as in JavScript Arrays to get the individual character.

JavaScript
let s = "hello";
console.log(s[1]);

Output

"e"

String Methods Create Copies

When you call a method like toUpperCase() or slice(), it returns a modified copy of the original string. The original string remains unaffected.

JavaScript
let s1 = "hello";
let s2 = s1.toUpperCase();
console.log(s2);
console.log(s1);

Output

"HELLO"
"hello"

Splitting and Joining Strings

The split() method allows you to break a string into an array, and join() does the opposite by joining elements of an array into a single string.

JavaScript
let s1 = "apple,banana";
let s2 = s1.split(",");
console.log(s2);
console.log(s2.join(" & ")); 

Output

["apple", "banana"]
"apple & banana"

Add Padding with padStart() and padEnd()

ES2017 introduced padStart() and padEnd() by which we can add padding characters to the beginning or end.

JavaScript
let s = "5";
console.log(s.padStart(3, "0"));
console.log(s.padEnd(3, "-")); 

Output

"005"
"5--"

Reversing a String

Although JavaScript doesn’t have a built-in reverse method for strings, you can reverse a string by combining split(), reverse(), and join() methods.

JavaScript
let s1 = "hello";
let s2 = s1.split("").reverse().join("");
console.log(s2); 

Output

"olleh"

String Length as a Property

Unlike arrays, you can get the length of a string directly with .length.

JavaScript
let s = "hello";
console.log(s.length);

Output

5

Working with Multi-Line Strings

Template literals allow to write multi-line strings without using escape characters (\n).

JavaScript
let s = `Roses are red,
Violets are blue,
JavaScript is fun,
And so are you!`;
console.log(s);

Output

Roses are red,
Violets are blue,
JavaScript is fun,
And so are you!

Check for Substrings Easily

JavaScript provides includes(), startsWith(), and endsWith() methods, which makes easy to check substrings.

JavaScript
let s = "JavaScript is great";
console.log(s.includes("JavaScript")); 
console.log(s.startsWith("Java"));   
console.log(s.endsWith("great"));  

Output

true
true
true

Next Article
JavaScript Coding Questions and Answers

S

souravsharma098
Improve
Article Tags :
  • JavaScript
  • Web Technologies
  • javascript-string

Similar Reads

    JavaScript - Insert Character in JS String
    In JavaScript, characters can be inserted at the beginning, end, or any specific position in a string. JavaScript provides several methods to perform these operations efficiently.At the BeginningTo insert a character at the beginning of a string, you can use string concatenation or template literals
    1 min read
    Convert Array to String in JavaScript
    In JavaScript, converting an array to a string involves combining its elements into a single text output, often separated by a specified delimiter. This is useful for displaying array contents in a readable format or when storing data as a single string. The process can be customized to use differen
    7 min read
    JavaScript Coding Questions and Answers
    JavaScript is the most commonly used interpreted, and scripted Programming language. It is used to make web pages, mobile applications, web servers, and other platforms. Developed in 1995 by Brendan Eich. Developers should have a solid command over this because many job roles need proficiency in Jav
    15+ min read
    JavaScript - Add Characters to a String
    Here are the various approaches to add characters to a string in JavaScriptUsing the + Operator - Most PopularThe + operator is the simplest way to add characters to a string. It concatenates one or more strings or characters without modifying the original string.JavaScriptconst s1 = "Hello"; const
    2 min read
    JavaScript - Convert String to Array
    Strings in JavaScript are immutable (cannot be changed directly). However, arrays are mutable, allowing you to perform operations such as adding, removing, or modifying elements. Converting a string to an array makes it easier to:Access individual characters or substrings.Perform array operations su
    5 min read
    JavaScript String() Constructor
    The JavaScript String() Constructor is used to can be used as a constructor or a function. that creates a new string object. It can be used in two different ways:Syntax:Invoked with the new keyword:new String(object);Invoked without the new keyword:String(object);Parameters: This constructor accepts
    3 min read
`; $(commentSectionTemplate).insertBefore(".article--recommended"); } loadComments(); }); }); function loadComments() { if ($("iframe[id*='discuss-iframe']").length top_of_element && top_of_screen articleRecommendedTop && top_of_screen articleRecommendedBottom)) { if (!isfollowingApiCall) { isfollowingApiCall = true; setTimeout(function(){ if (loginData && loginData.isLoggedIn) { if (loginData.userName !== $('#followAuthor').val()) { is_following(); } else { $('.profileCard-profile-picture').css('background-color', '#E7E7E7'); } } else { $('.follow-btn').removeClass('hideIt'); } }, 3000); } } }); } $(".accordion-header").click(function() { var arrowIcon = $(this).find('.bottom-arrow-icon'); arrowIcon.toggleClass('rotate180'); }); }); window.isReportArticle = false; function report_article(){ if (!loginData || !loginData.isLoggedIn) { const loginModalButton = $('.login-modal-btn') if (loginModalButton.length) { loginModalButton.click(); } return; } if(!window.isReportArticle){ //to add loader $('.report-loader').addClass('spinner'); jQuery('#report_modal_content').load(gfgSiteUrl+'wp-content/themes/iconic-one/report-modal.php', { PRACTICE_API_URL: practiceAPIURL, PRACTICE_URL:practiceURL },function(responseTxt, statusTxt, xhr){ if(statusTxt == "error"){ alert("Error: " + xhr.status + ": " + xhr.statusText); } }); }else{ window.scrollTo({ top: 0, behavior: 'smooth' }); $("#report_modal_content").show(); } } function closeShareModal() { const shareOption = document.querySelector('[data-gfg-action="share-article"]'); shareOption.classList.remove("hover_share_menu"); let shareModal = document.querySelector(".hover__share-modal-container"); shareModal && shareModal.remove(); } function openShareModal() { closeShareModal(); // Remove existing modal if any let shareModal = document.querySelector(".three_dot_dropdown_share"); shareModal.appendChild(Object.assign(document.createElement("div"), { className: "hover__share-modal-container" })); document.querySelector(".hover__share-modal-container").append( Object.assign(document.createElement('div'), { className: "share__modal" }), ); document.querySelector(".share__modal").append(Object.assign(document.createElement('h1'), { className: "share__modal-heading" }, { textContent: "Share to" })); const socialOptions = ["LinkedIn", "WhatsApp","Twitter", "Copy Link"]; socialOptions.forEach((socialOption) => { const socialContainer = Object.assign(document.createElement('div'), { className: "social__container" }); const icon = Object.assign(document.createElement("div"), { className: `share__icon share__${socialOption.split(" ").join("")}-icon` }); const socialText = Object.assign(document.createElement("span"), { className: "share__option-text" }, { textContent: `${socialOption}` }); const shareLink = (socialOption === "Copy Link") ? Object.assign(document.createElement('div'), { role: "button", className: "link-container CopyLink" }) : Object.assign(document.createElement('a'), { className: "link-container" }); if (socialOption === "LinkedIn") { shareLink.setAttribute('href', `https://www.linkedin.com/sharing/share-offsite/?url=${window.location.href}`); shareLink.setAttribute('target', '_blank'); } if (socialOption === "WhatsApp") { shareLink.setAttribute('href', `https://api.whatsapp.com/send?text=${window.location.href}`); shareLink.setAttribute('target', "_blank"); } if (socialOption === "Twitter") { shareLink.setAttribute('href', `https://twitter.com/intent/tweet?url=${window.location.href}`); shareLink.setAttribute('target', "_blank"); } shareLink.append(icon, socialText); socialContainer.append(shareLink); document.querySelector(".share__modal").appendChild(socialContainer); //adding copy url functionality if(socialOption === "Copy Link") { shareLink.addEventListener("click", function() { var tempInput = document.createElement("input"); tempInput.value = window.location.href; document.body.appendChild(tempInput); tempInput.select(); tempInput.setSelectionRange(0, 99999); // For mobile devices document.execCommand('copy'); document.body.removeChild(tempInput); this.querySelector(".share__option-text").textContent = "Copied" }) } }); // document.querySelector(".hover__share-modal-container").addEventListener("mouseover", () => document.querySelector('[data-gfg-action="share-article"]').classList.add("hover_share_menu")); } function toggleLikeElementVisibility(selector, show) { document.querySelector(`.${selector}`).style.display = show ? "block" : "none"; } function closeKebabMenu(){ document.getElementById("myDropdown").classList.toggle("show"); }
geeksforgeeks-footer-logo
Corporate & Communications Address:
A-143, 7th Floor, Sovereign Corporate Tower, Sector- 136, Noida, Uttar Pradesh (201305)
Registered Address:
K 061, Tower K, Gulshan Vivante Apartment, Sector 137, Noida, Gautam Buddh Nagar, Uttar Pradesh, 201305
GFG App on Play Store GFG App on App Store
Advertise with us
  • Company
  • About Us
  • Legal
  • Privacy Policy
  • In Media
  • Contact Us
  • Advertise with us
  • GFG Corporate Solution
  • Placement Training Program
  • Languages
  • Python
  • Java
  • C++
  • PHP
  • GoLang
  • SQL
  • R Language
  • Android Tutorial
  • Tutorials Archive
  • DSA
  • DSA Tutorial
  • Basic DSA Problems
  • DSA Roadmap
  • Top 100 DSA Interview Problems
  • DSA Roadmap by Sandeep Jain
  • All Cheat Sheets
  • Data Science & ML
  • Data Science With Python
  • Data Science For Beginner
  • Machine Learning
  • ML Maths
  • Data Visualisation
  • Pandas
  • NumPy
  • NLP
  • Deep Learning
  • Web Technologies
  • HTML
  • CSS
  • JavaScript
  • TypeScript
  • ReactJS
  • NextJS
  • Bootstrap
  • Web Design
  • Python Tutorial
  • Python Programming Examples
  • Python Projects
  • Python Tkinter
  • Python Web Scraping
  • OpenCV Tutorial
  • Python Interview Question
  • Django
  • Computer Science
  • Operating Systems
  • Computer Network
  • Database Management System
  • Software Engineering
  • Digital Logic Design
  • Engineering Maths
  • Software Development
  • Software Testing
  • DevOps
  • Git
  • Linux
  • AWS
  • Docker
  • Kubernetes
  • Azure
  • GCP
  • DevOps Roadmap
  • System Design
  • High Level Design
  • Low Level Design
  • UML Diagrams
  • Interview Guide
  • Design Patterns
  • OOAD
  • System Design Bootcamp
  • Interview Questions
  • Inteview Preparation
  • Competitive Programming
  • Top DS or Algo for CP
  • Company-Wise Recruitment Process
  • Company-Wise Preparation
  • Aptitude Preparation
  • Puzzles
  • School Subjects
  • Mathematics
  • Physics
  • Chemistry
  • Biology
  • Social Science
  • English Grammar
  • Commerce
  • World GK
  • GeeksforGeeks Videos
  • DSA
  • Python
  • Java
  • C++
  • Web Development
  • Data Science
  • CS Subjects
@GeeksforGeeks, Sanchhaya Education Private Limited, All rights reserved
We use cookies to ensure you have the best browsing experience on our website. By using our site, you acknowledge that you have read and understood our Cookie Policy & Privacy Policy
Lightbox
Improvement
Suggest Changes
Help us improve. Share your suggestions to enhance the article. Contribute your expertise and make a difference in the GeeksforGeeks portal.
geeksforgeeks-suggest-icon
Create Improvement
Enhance the article with your expertise. Contribute to the GeeksforGeeks community and help create better learning resources for all.
geeksforgeeks-improvement-icon
Suggest Changes
min 4 words, max Words Limit:1000

Thank You!

Your suggestions are valuable to us.

What kind of Experience do you want to share?

Interview Experiences
Admission Experiences
Career Journeys
Work Experiences
Campus Experiences
Competitive Exam Experiences