Do I need ES6 features to follow these examples?

Most examples use core syntax supported by modern browsers. ES6 features are noted where used.

Can I modify and share these examples?

Yes. These are for learning—copy, tweak, and share your variations for practice.

Where should beginners start?

Begin with Hello World, variables, arithmetic, then progress to control flow, functions, strings, and arrays.

Objects and Key-Value Utilities

Create, clone, merge, and iterate over objects. Add and remove properties, count keys, and use modern patterns to manage key–value data structures effectively.

Try JavaScript Compiler

JavaScript Program to Merge Property of Two Objects

Merge using spread.

const a={x:1}, b={y:2}; const c={...a,...b}; console.log(c);

Output

JavaScript Program to Create Objects in Different Ways

Object literal, constructor, class.

                          const o1={x:1}; function Person(n){this.name=n;} const o2=new Person("Ann"); class Car{constructor(m){this.model=m;}} const o3=new Car("Civic"); console.log(o1,o2,o3);
                        

Output

JavaScript Program to Remove a Property from an Object

Delete a property.

const o={a:1,b:2}; delete o.b; console.log(o);

Output

JavaScript Program to Check if a Key Exists in an Object

Use in operator.

const o={a:1}; console.log("a" in o);

Output

JavaScript Program to Clone a JS Object

Clone using structuredClone.

const o={a:1,b:{c:2}}; const c=structuredClone(o); console.log(c);

Output

JavaScript Program to Loop Through an Object

Loop entries.

const o={a:1,b:2}; for(const [k,v] of Object.entries(o)){ console.log(k,v); }

Output

JavaScript Program to Count the Number of Keys/Properties in an Object

Use Object.keys length.

const o={a:1,b:2,c:3}; console.log(Object.keys(o).length);

Output

JavaScript Program to Add Key/Value Pair to an Object

Assign a new key.

const o={}; o.name="Alice"; console.log(o);

Output

JavaScript Program to Sort Array of Objects by Property Values

Sort by property.

const a=[{n:2},{n:1}]; a.sort((x,y)=>x.n-y.n); console.log(a);

Output

JavaScript Program to Find ASCII Value of Character

Use charCodeAt.

const ch="A"; console.log(ch.charCodeAt(0));

Output

Keep Practicing

Use the online compiler to run examples and test variations. Reinforce learning by building small scripts for each topic.

FAQ

Yes. You can copy the code into the JavaScript compiler page or your browser console to see the output. Some examples use console.log to print results.

Most examples use foundational syntax available in modern browsers. Where templates or arrow functions are used, they follow ES6 conventions widely supported today.

Absolutely. These examples are provided for learning. Copy, tweak values, and experiment to understand how the logic changes.

Start with Hello World, variables, and arithmetic. Then try control flow, functions, strings, and arrays to build confidence.

Learn JavaScript by Practicing Examples

Hands-on practice is the fastest way to understand JavaScript. Each example above focuses on a single concept—from strings, arrays, and objects to math utilities, dates, loops, and functions. Try editing variables, adding conditions, or refactoring logic, then observe the output changes instantly.

Use our tools to deepen your learning: JavaScript Compiler to run snippets, and the JavaScript Tutorial for guided theory and practice.

Beginner-Friendly

Start with variables, operators, and control flow. Build confidence with simple, readable programs.

Practical Patterns

Practice common tasks like formatting strings, manipulating arrays, and working with dates.

Grow Skills

Advance to objects, classes, and asynchronous patterns such as promises and async/await.

Objects and Key-Value Utilities

JavaScript Program to Merge Property of Two Objects

Output

JavaScript Program to Create Objects in Different Ways

Output

JavaScript Program to Remove a Property from an Object

Output

JavaScript Program to Check if a Key Exists in an Object

Output

JavaScript Program to Clone a JS Object

Output

JavaScript Program to Loop Through an Object

Output

JavaScript Program to Count the Number of Keys/Properties in an Object

Output

JavaScript Program to Add Key/Value Pair to an Object

Output

JavaScript Program to Sort Array of Objects by Property Values

Output

JavaScript Program to Find ASCII Value of Character

Output

Keep Practicing

FAQ

Can I run these examples in the browser?

Do I need ES6 features to follow these examples?

Can I copy and modify the examples?

Where should beginners start?

Learn JavaScript by Practicing Examples

Beginner-Friendly

Practical Patterns

Grow Skills