WebDevStory
  • Tech
    • Software Testing
    • IT and Management
    • Software Engineering
    • Technology
  • Web
    • JavaScript
    • Web Development
    • Front-end Development
    • React
    • Database Technologies
  • AI
    • AI and Machine Learning
    • AI in Education
    • AI Learning
    • AI Prompts
  • Programming
    • Coding
    • Design Patterns
  • Misc
    • Digital Transformation
    • SEO
    • Technology and Business
    • Technology and Innovation
    • Developer Roadmaps
    • Digital Marketing
  • More
    • Newsletter
    • Support Us
    • Contact
    • Tech & Lifestyle
    • Digital Nomadism
  • Services
No Result
View All Result
WebDevStory
  • Tech
    • Software Testing
    • IT and Management
    • Software Engineering
    • Technology
  • Web
    • JavaScript
    • Web Development
    • Front-end Development
    • React
    • Database Technologies
  • AI
    • AI and Machine Learning
    • AI in Education
    • AI Learning
    • AI Prompts
  • Programming
    • Coding
    • Design Patterns
  • Misc
    • Digital Transformation
    • SEO
    • Technology and Business
    • Technology and Innovation
    • Developer Roadmaps
    • Digital Marketing
  • More
    • Newsletter
    • Support Us
    • Contact
    • Tech & Lifestyle
    • Digital Nomadism
  • Services
No Result
View All Result
WebDevStory
No Result
View All Result
Home JavaScript

25 Advanced JavaScript Features You Should Know

Uncover the Hidden Powers of JavaScript

Mainul Hasan by Mainul Hasan
December 28, 2024
in JavaScript, Web Development
Reading Time: 5 mins read
0 0
2
Stylized JavaScript JS logo alongside Advanced text, representing in-depth JavaScript programming concepts
0
SHARES
498
VIEWS

As developers, we often write similar types of code and follow a pattern that may be comfortable for us; sometimes, it creates a sense of boring coding life.

However, we know JavaScript is vast and has many advanced features; discovering and using it can transform our development work and make it a more exciting and fulfilling life.

In this guide, we will explore 25 advanced JavaScript features that will enrich our JavaScript knowledge.

Table of Contents

    1. Labels for Loop and Block Statements

    JavaScript allows labeling loops and block statements, enabling precise control with break and continue.

    
            outerLoop: for (let i = 0; i < 5; i++) {
                innerLoop: for (let j = 0; j < 5; j++) {
                    if (i === 2 && j === 2) break outerLoop;
                    console.log(`i=${i}, j=${j}`);
                }
            }
        

    2. Comma Operator

    The comma operator allows multiple expressions to be evaluated in a sequence, returning the last expression’s result.

    
            let a = (1, 2, 3); // a = 3
        

    3. Tagged Template Literals Beyond String Formatting

    Beyond creating strings, tagged templates can be used for DSLs (Domain Specific Languages), sanitizing user input, or localization.

    
            function htmlEscape(strings, ...values) {
                // Example implementation
            }
        

    4. Function Declarations Inside Blocks

    Though not recommended, JavaScript allows function declarations inside blocks, which can lead to different behaviors in non-strict mode.

    
            if (true) {
                function test() { 
                    return "Yes"; 
                }
            } else {
                function test() { 
                    return "No"; 
                }
            }
            test(); // Behavior varies depending on the environment
        

    5. void Operator

    The void operator evaluates any expression and then returns undefined, useful for hyperlinks with JavaScript.

    
            void (0); // returns undefined
        

    6. Bitwise Operators for Quick Math

    Bitwise operators, like | and &, can perform some math operations much faster, though at the cost of readability.

    
            let floor = 5.95 | 0; // Fast way to do Math.floor(5.95)
        

    7. with Statement for Working with Objects

    The with statement extends the scope chain for a block, allowing you to write shorter code. However, it’s not recommended due to readability and performance concerns.

    
            with (document.getElementById("myDiv").style) {
                background = "black";
                color = "white";
            }
        

    8. Automatic Semicolon Insertion (ASI)

    JavaScript tries to fix missing semicolons, but relying on it can lead to unexpected results.

    
            let x = 1;
            let y = 2;
            [x, y] = [y, x]; // Without proper semicolons, this could fail
        

    9. The Intl Object for Advanced Localization

    The Intl object provides tools for internationalization (i18n) using this we can handle date, time, number formatting, and language-sensitive string comparisons.

    # Formatting Numbers

    
            const formatter = new Intl.NumberFormat(
                'en-US', 
                { 
                    style: 'currency', 
                    currency: 'USD' 
                }
            );
            console.log(formatter.format(123456.789)); // $123,456.79
        

    # Formatting Dates

    
            const dateFormatter = new Intl.DateTimeFormat(
                'de-DE', 
                { 
                    dateStyle: 'long' 
                }
            );
            console.log(
                dateFormatter.format(new Date())
            ); // Example: 28. Dezember 2024
        

    # Collator for String Comparisons

    
            const collator = new Intl.Collator(
                'en', 
                { 
                    sensitivity: 'base' 
                }
            );
            console.log(
                collator.compare('a', 'A')
            ); // 0 (treats them as equal)
        

    10. instanceof vs. typeof

    instanceof checks the prototype chain, while typeof returns a string indicating the type of the unevaluated operand.

    
            function Person(){}
            let person = new Person();
            console.log(person instanceof Person); // true
            console.log(typeof person); // "object"
        

    11. Block-Level Functions in ES6

    ES6 allows functions to be block-scoped, similar to let and const.

    
            {
                function test() { 
                    return "block scoped"; 
                }
            }
            console.log(typeof test); 
            // "function" in non-strict mode, "undefined" in strict mode
        

    12. debugger Statement

    Use the debugger statement to pause execution and open the debugger.

    
            function problematicFunction() {
                debugger; // Execution pauses here if the developer tools are open
            }
        

    13. eval() for Dynamic Code Execution

    eval executes a string as JavaScript code but comes with significant security and performance implications.

    
            eval("let a = 1; console.log(a);"); // 1
        

    14. Non-standard __proto__ Property

    While __proto__ is widely supported for setting an object’s prototype, it’s non-standard. Use Object.getPrototypeOf() and Object.setPrototypeOf() instead.

    
            let obj = {};
            obj.__proto__ = Array.prototype; // Not recommended
        

    15. document.write() for Direct Document Editing

    document.write() directly writes to the HTML document, but using it can have negative implications, especially for loading external scripts synchronously.

    
            document.write("<h1>Hello World!</h1>");
        

    16. Chained Assignment

    JavaScript allows for chained assignments, which can assign a single value to multiple variables in one statement.

    
            let a, b, c;
            a = b = c = 5; // Sets all three variables to the value of 5
        

    17. The in Operator for Property Existence

    The in operator checks if a property exists within an object without accessing the property value.

    
            const car = { 
                make: 'Toyota', 
                model: 'Corolla' 
            };
            console.log('make' in car); // true
        

    18. Object Property Shorthand

    When assigning properties to an object, if the property name is the same as the variable name, you can use the shorthand.

    
            const name = 'Alice';
            const age = 25;
            const person = { name, age };
        

    19. Default Parameter Values and Destructuring Combined

    You can combine default parameter values with destructuring in function parameters for more readable and flexible function definitions.

    
            function createPerson({ name = 'Anonymous', age = 0 } = {}) {
                console.log(`Name: ${name}, Age: ${age}`);
            }
            createPerson({ name: 'Alice' }); // Name: Alice, Age: 0
            createPerson(); // Name: Anonymous, Age: 0
        

    20. Using Array.fill() to Initialize Arrays

    Quickly initialize an array with a specific value using the fill() method.

    
            const initialArray = new Array(5).fill(0); // Creates an array [0, 0, 0, 0, 0]
        

    21. Array.includes() for Presence Check

    Easily check for the presence of an element within an array with the includes() method, which is more readable than using indexOf().

    
            const fruits = ['apple', 'banana', 'mango'];
            console.log(fruits.includes('banana')); // true
        

    22. Destructuring Aliases

    When destructuring an object, you can assign properties to variables with different names using aliases.

    
            const obj = { x: 1, y: 2 };
            const { x: newX, y: newY } = obj;
            console.log(newX); // 1
        

    23. Nullish Coalescing Operator for Default Values

    Use ?? to provide default values only when dealing with null or undefined, not other falsy values like 0 or ''.

    
            const count = 0;
            console.log(count ?? 10); 
            // 0, because count is not null or undefined
        

    24. Dynamic Function Names

    Create functions with dynamic names using computed property names in object literals.

    
            const dynamicName = 'func';
            const obj = {
                [dynamicName]() {
                    return 'Dynamic Function Name!';
                }
            };
            console.log(obj.func()); 
            // "Dynamic Function Name!"
        

    25. Private Class Fields

    Use the hash # prefix to define private fields in a class, which cannot be accessed from outside the class.

    
            class Counter {
                #count = 0; // Private class field
    
                increment() {
                    this.#count++;
                }
    
                getCount() {
                    return this.#count;
                }
            }
        

    Further Reading & Resources

    • MDN Web Docs: JavaScript Reference
    • Eloquent JavaScript by Marijn Haverbeke
    • You Don’t Know JS Yet: Get Started
    • JavaScript.info
    • Programming with JavaScript
    • 30 JavaScript Tricky Hacks
    • HTTP Requests in JavaScript

    Wrap Up

    I hope you enjoy these 25 advanced JavaScript features. Let me know which one is new for you, and if you have any other questions, feel free to share them in the comments.

    Let’s keep pushing the boundaries of what we can achieve with JavaScript, staying curious and open to the endless possibilities.

    🚀 Before You Go:

    • 👏 Found this guide helpful? Give it a like!
    • 💬 Got thoughts? Share your insights!
    • 📤 Know someone who needs this? Share the post!
    • 🌟 Your support keeps us going!

    💻 Level up with the latest tech trends, tutorials, and tips - Straight to your inbox – no fluff, just value!

    Join the Community →
    Tags: Advanced JavaScriptcoding best practicesJavascriptJavaScript TipsProgramming Tipsweb development
    ADVERTISEMENT
    Previous Post

    Scalable Cloud Data Management: Key Concepts and Challenges

    Next Post

    150 JavaScript Interview Questions & Answers – Nail Your Tech Interview

    Related Posts

    Open notebook with questions for JavaScript interview preparation
    Front-end Development

    150 JavaScript Interview Questions & Answers – Nail Your Tech Interview

    December 29, 2024
    Collaborative web design and hosting integration with creative and technical teamwork
    Web Development

    Best Practices for Web Design and UX Hosting Integration

    December 21, 2024
    Developers working with JavaScript code on multiple screens
    JavaScript

    Essential Topics for JavaScript Mastery

    November 7, 2024
    Cloud technology representing OneDrive integration with React and Microsoft Graph API
    Web Development

    OneDrive Integration with React: Step-by-Step Guide

    September 21, 2024
    Hands typing on a laptop with API development icons, showcasing technology and integration
    Web Development

    Integrate Dropbox API with React: A Comprehensive Guide

    September 6, 2024
    Best React Frameworks concept with geometric shapes representing modular design
    Web Development

    Best React Frameworks: Which One Should You Choose and When?

    September 5, 2024
    Next Post
    Open notebook with questions for JavaScript interview preparation

    150 JavaScript Interview Questions & Answers – Nail Your Tech Interview

    Comments 2

    1. Tempa says:
      1 year ago

      I do not even know how I ended up here but I thought this post was great I dont know who you are but definitely youre going to a famous blogger if you arent already Cheers.

      Reply
    2. Dev 6 says:
      11 months ago

      25. Private Class Fields
      ………….
      class Counter {
      #count = 0;

      increment() {
      this.#count++;
      }

      getCount() {
      return this.#count;
      }
      }

      var a = new Counter();
      a.increment()
      console.log(a.getCount())
      console.log(a.#count)
      ………….
      Can you check that

      Reply

    Leave a Reply Cancel reply

    Your email address will not be published. Required fields are marked *

    Save 20% with Code mainul76 on Pictory AI - Limited-Time Discount Save 20% with Code mainul76 on Pictory AI - Limited-Time Discount Save 20% with Code mainul76 on Pictory AI - Limited-Time Discount

    You might also like

    User interface of a blog application showing a list of posts with titles, authors, and publication dates

    Building a Blogging Site with React and PHP: A Step-by-Step Guide

    February 10, 2024
    JavaScript ES6 features for React development

    Essential ES6 Features for Mastering React

    July 26, 2023
    Word cloud featuring modern software development key terms.

    Modern Software Development Practices, Terms and Trends

    January 23, 2024
    Globe with HTTP Protocol - Understanding JavaScript HTTP Request Libraries

    HTTP Requests in JavaScript: Popular Libraries for Web Developers

    March 5, 2024
    Stylized JavaScript JS logo alongside Advanced text, representing in-depth JavaScript programming concepts

    25 Advanced JavaScript Features You Should Know

    December 28, 2024
    Hands typing on a laptop with API development icons, showcasing technology and integration

    Integrate Dropbox API with React: A Comprehensive Guide

    September 6, 2024
    Fiverr affiliates promotional banner - Get paid to share Fiverr with your network. Start Today. Fiverr affiliates promotional banner - Get paid to share Fiverr with your network. Start Today. Fiverr affiliates promotional banner - Get paid to share Fiverr with your network. Start Today.
    Coursera Plus promotional banner - Save 40% on one year of Coursera Plus. Subscribe now. Coursera Plus promotional banner - Save 40% on one year of Coursera Plus. Subscribe now. Coursera Plus promotional banner - Save 40% on one year of Coursera Plus. Subscribe now.
    Namecheap .COM domain promotional banner - Get a .COM for just $5.98. Secure a mighty domain for a mini price. Claim now. Namecheap .COM domain promotional banner - Get a .COM for just $5.98. Secure a mighty domain for a mini price. Claim now. Namecheap .COM domain promotional banner - Get a .COM for just $5.98. Secure a mighty domain for a mini price. Claim now.
    WebDevStory logo

    Empowering your business with tailored web solutions, expert SEO, and cloud integration to fuel growth and innovation.

    Contact Us

    Hans Ross Gate 3, 0172, Oslo, Norway

    +47-9666-1070

    info@webdevstory.com

    Stay Connected

    • Contact
    • Privacy Policy

    © webdevstory.com

    Welcome Back!

    Login to your account below

    Forgotten Password?

    Retrieve your password

    Please enter your username or email address to reset your password.

    Log In
    No Result
    View All Result
    • Tech
      • Software Testing
      • IT and Management
      • Software Engineering
      • Technology
    • Web
      • JavaScript
      • Web Development
      • Front-end Development
      • React
      • Database Technologies
    • AI
      • AI and Machine Learning
      • AI in Education
      • AI Learning
      • AI Prompts
    • Programming
      • Coding
      • Design Patterns
    • Misc
      • Digital Transformation
      • SEO
      • Technology and Business
      • Technology and Innovation
      • Developer Roadmaps
      • Digital Marketing
    • More
      • Newsletter
      • Support Us
      • Contact
      • Tech & Lifestyle
      • Digital Nomadism
    • Services

    © webdevstory.com