Top 10 Most Exciting ES6 Features in JavaScript

Introduction

JavaScript is undoubtedly one of the most popular programming languages in today’s world and has gone through significant development over the years.

It went through quite an evolution up to the release of ECMAScript 6, also known as ES6 or ECMAScript 2015, as a very important step forward.

This blog post focuses on top features in ES6 Javascript to provide those who are still in doubt about developing with Java or Javascript the required information. Additionally, we have written an article on the top 9 JavaScript frameworks where you will find relevant information to consider.

Keep reading to know what are es6 features in javascript?

What Is ECMAScript 6?

ES6 establishes the current Javascript implementation trend 2026, which is more widely used than ES5 because it incorporates even better implemented ES6 features and syntax.

Also, it brings numerous new features in es6 and es6 syntax enhancements that has changed to some extent the way developers code JavaScript.

This change, ES6, is a remarkable step forward in the functionality and use of the JavaScript language. There are several interventions that has been made in JavaScript programming in order to make it more fun.

Here we have discussed in very comprehensive detail some of the important keywords and operators for programming as follows: Rest and spread operators Let and const Template literals Modules Classes etc. Now, before we go out seeking to hire skilled Javascript developers let us begin by outlining some of the best ES6 features that they can apply in coding. 

Setting Defaults For Function Parameters

To get default values for function parameters in the past, you’d have to do something like this:

      function findPower(val, exponent) {
        exponent = exponent || 2
      // ...
      }
    

Developers can create and default the parameters by using the new default parameters functionality.

      function findPower(value, exponent = 2) {
        // The rest of your code
      }
      findPower(1, undefined) // exponent defaults to 2
    

Extracting Data From Arrays And Objects With Destructuring

ES6 features in javascript with examples

Developers can extract values from arrays and objects by destructuring them and then exposing them as separate variables.

Destructuring has a wide range of applications, including situations where specific values from a bigger collection are required.

It provides a technique for quickly obtaining that value via a built-in feature of the language.

A Destructuring object syntax is with ‘ { } ‘ and the destructuring array syntax is with square brackets ‘ [ ] ’

Array case: const [one, two] = [1, 2]

      Object case: const {a, b} = { a: ‘a’, b: ‘b’ }

For Instance, Destructuring Example 1:

      function functionName() {
        return [name, age]
      }
      const [name,age] = functionName()
    

For Instance, Destructuring Example 2:

      const [first, second, ...theReaming] = my_array_elements
    

Destructuring Example 3:

      var person = {
        name: "Alex",
        gender: Male
      }
      var name = person.name
      var gender= person.gender
    

Using Destructuring in ES6, you can grab object values:

      const { name, title, data } = person
    

Allowing Extra Arguments In Functions

Rest parameters allow functions to collect additional arguments in addition to the ones they’ve already defined.

After that, the contents of these arguments are gathered into an array.

This allows a function to capture and parse additional parameters, allowing for many more optimization possibilities than were previously available through the arguments object.

Rest parameters now work with arrow functions, which is excellent because arrow functions previously didn’t have this capacity because the arguments object didn’t exist within them.

      function combine(joiner, ...args) {
        // args is an actual Array
        return args.join(joiner)
      }
      combine('_', 1, 2, 3,4,5) // returns '1_2_3_4_5
    

Expanding Arrays With The Spread Operator

The spread operator is a versatile utility that is now available in JavaScript.

Expanding an array into arguments for functions or array literals is a valuable feature.

Reusing values, for instance, is beneficial because it requires a smaller footprint to store and call them due to the spread.

The spread operator is useful in functional parameters

      const numbersArray = [1, 2, 3]
      findSum(...numbersArray)
      // same as
      findSum(1, 2, 3)
    

Using the spread operator in array literal parameters:

      const array1 = [1, 2]
      const array12= [...array1 , 3, 4]
      // array2: [1, 2, 3, 4]
    

Arrow Functions

ES6 arrow functions provide you with an alternative way to write a shorter syntax compared to the function expression.

The following example defines a function expression that returns the sum of two numbers:

      let sum= function (a, b) {
        return a + b;
      };
      console.log(sum(100, 200)); // 300
    

The following example is equivalent to the above add() function expression but uses an arrow function instead:

      let sum= (a, b) => x + y;
      console.log(sum(100, 200)); // 300
    

Multi-Line String

With the arrival of Template Literals, it’s finally super easy to produce multi-line strings. Previously, we had to use the \n or separate string concatenation which was messy and difficult to read. Finally, it’s easier now. ES6 for the win;

// Old way
      const multiLine = "first \n second";
      // ES6 new way
      const multiLine = `first
      2️second`;
      /* RESULT
      first
      second
      */
    

Template Literals

ES6 introduces very simple string templates along with placeholders for the variables.

The syntax for using the string template is $ { PARAMETER } and is used inside of the back-ticked string.

      let name = `My name is ${firstName} ${lastName}`
    

Promises

In ES6, Promises are used for asynchronous execution.

However, we can use promises with the arrow function…

      var asyncCall = new Promise((resolve, reject) => {
          // do something here
          resolve();
        }).then(()=> {
          console.log(‘Done’);
        })
    

Modules

Modules were previously not supported natively in JavaScript.

Furthermore, Modules are es6 features in js where each module is represented by a separate “.js” file.

We can import or export variables, functions, classes, or any other component from/to different files and modules using the “import” or “export” declaration in a module.

      export var num = 100;
      export function name(fullName) {
        // data
      };
      import {num, name} from 'module';
      console.log(num); // 100
    

Features Of ES6

ES6 (ECMAScript 2015) has several features:

Better Readability: Because ES6 shims features like arrow functions. and template literals are compact and clear. they improve the development process.

Safer Variable Scoping: Use of let and const provides block-scoped variables. which makes the code reliable. By avoiding the creation of hoisting bugs.

Default Parameters and Rest Parameters: These functionalities make functional parameters more manageable. and making code more convenient.

Enhanced Maintainability: The programming concept of classes and modules helps to organize and manage code. Which is particularly helpful when working on large projects.

      let and const : Provide better scope for the variable. Makes the code highly predictable.
    

Cleaner code: ES6 arrow functions and template literals simplify repetitive code. Makes the code naturally readable. 

Simplify Functions with Destructuring and Default Parameters: ES6 destructuring and default parameters simplify the syntax. 

Use Spread and Rest Operators to Work Smarter: Spread and rest operators simplify and make daily tasks easier to read.

Classes, Promises, and Modules: ES6 introduces classes, promises, and modules to help you create better applications. This aids developers in organizing and managing complex applications.

ES6 Makes JavaScript Development Easy Increased Efficiency ES6 speeds up development. Debugging is simpler. Improved cooperation. 

Practical Tips To Adopt ES6 In Projects 

1. Use `const` by Default for Safer and More Predictable Code 

When writing ES6, developers should use `const` for variables. Use “let” only when it is highly crucial to reassign the value in the future. This approach minimizes accidental changes. Overall code becomes highly predictable. 

Best practices:

• Prefer const by default
• Use “let” only for reassignment
• Avoid unnecessary mutable variables
• Keep variable scope small
• Improve code readability

2. Use Modern Build Tools for Production Projects 

In 2026, react and Javascript projects are incapable of rendering browser scripts manually. Modern bundlers efficiently bundle the modules. Optimize the performance. Make the production deployment highly reliable. 

Recommended tools:

• Vite
• Webpack
• Rollup
• Babel (for older browser support)
• Production build optimization

3. Standardize Async Code with async/await 

Callback-based code and deeply nested Promise chains quickly become difficult to read. Async/await. asynchronous operation makes the operation readable. This simplifies the debugging and maintenance. 

Use async/await for:

• API requests
• Database calls
• File operations
• Error handling
• Cleaner control flow

4. Write Cleaner Functions with Destructuring and Default Parameters 

Function signatures should not be unnecessarily wrong and repetitive. ES6 makes the destructuring and default parameters code concise. And handle missing arguments effectively. Without the need to create extra conditional logic. 

Adopt these features:

• Object destructuring
• Array destructuring
• Default parameters
• Cleaner function arguments
• Reduced boilerplate code

5. Use ESLint to Catch Problems Before They Reach Production 

Identifying bugs at the time of code review is highly helpful. ESLint enforces coding standards. Automatically highlights common JavaScript mistakes. 

ESLint helps you:

• Catch syntax errors
• Enforce coding standards
• Prevent common bugs
• Maintain consistent formatting

Conclusion

Using new syntax is not the only aspect of adopting ES6. It is a mindset about writing cleaner architecture. better readability and maintainable JavaScript. When developers use `const` by default. Use modern bundlers. Standardize async/await. Adopt ESLint-like tools. The complexity of the code then decreases. It appears to be dependable, scalable, and ready for production.