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.

Array Methods and Patterns

Master arrays: insert and remove items, deduplicate, sort, chunk into groups, compute intersections, and extract properties. These techniques form the backbone of list manipulation in JS.

Try JavaScript Compiler

JavaScript Program to Merge Two Arrays and Remove Duplicate Items

Merge then dedupe.

const a=[1,2], b=[2,3]; console.log(Array.from(new Set([...a,...b])));

Output

JavaScript Program to Remove Specific Item From an Array

Remove first match.

                          const a=[1,2,3,2]; const x=2; const i=a.indexOf(x); if(i>-1)a.splice(i,1); console.log(a);
                        

Output

JavaScript Program to Check if An Array Contains a Specified Value

Use includes.

console.log([1,2,3].includes(2));

Output

JavaScript Program to Insert Item in an Array

Insert at index using splice.

const a=[1,2,4]; a.splice(2,0,3); console.log(a);

Output

JavaScript Program to Append an Object to an Array

Push object.

const arr=[]; arr.push({id:1}); console.log(arr);

Output

JavaScript Program to Check if An Object is An Array

Use Array.isArray.

console.log(Array.isArray([]));

Output

JavaScript Program to Empty an Array

Set length to 0.

const a=[1,2,3]; a.length=0; console.log(a);

Output

JavaScript Program to Remove Duplicates From Array

Use Set.

const a=[1,2,2,3]; console.log([...new Set(a)]);

Output

JavaScript Program to Create Two Dimensional Array

Create matrix.

const m=Array.from({length:3},()=>Array(3).fill(0)); console.log(m);

Output

JavaScript Program to Compare Elements of Two Arrays

Check equality.

                          function equal(a,b){return a.length===b.length && a.every((v,i)=>v===b[i]);} console.log(equal([1,2],[1,2]));
                        

Output

JavaScript Program to Get Random Item From an Array

Pick random element.

const a=["a","b","c"]; console.log(a[Math.floor(Math.random()*a.length)]);

Output

JavaScript Program To Perform Intersection Between Two Arrays

Filter by inclusion.

const a=[1,2,3], b=[2,3,4]; console.log(a.filter(x=>b.includes(x)));

Output

JavaScript Program to Split Array into Smaller Chunks

Chunk an array.

                          function chunk(a,n){const r=[]; for(let i=0;i<a.length;i+=n){r.push(a.slice(i,i+n));} return r;} console.log(chunk([1,2,3,4,5],2));
                        

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.

Array Methods and Patterns

JavaScript Program to Merge Two Arrays and Remove Duplicate Items

Output

JavaScript Program to Remove Specific Item From an Array

Output

JavaScript Program to Check if An Array Contains a Specified Value

Output

JavaScript Program to Insert Item in an Array

Output

JavaScript Program to Append an Object to an Array

Output

JavaScript Program to Check if An Object is An Array

Output

JavaScript Program to Empty an Array

Output

JavaScript Program to Remove Duplicates From Array

Output

JavaScript Program to Create Two Dimensional Array

Output

JavaScript Program to Compare Elements of Two Arrays

Output

JavaScript Program to Get Random Item From an Array

Output

JavaScript Program To Perform Intersection Between Two Arrays

Output

JavaScript Program to Split Array into Smaller Chunks

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