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lesson_01.js

1// Fetch user data from API
2async function getUser(id) {
3  const res = await fetch(
4    `/api/users/${id}`
5  );
6  const data = await res.json();
7  return data;
8}
9 
10// Try it:
11getUser(42).then(console.log);

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Learning Paths

Choose your direction.
Build your future.

Structured paths from zero to job-ready. Every path includes live coding examples, quizzes, and real project builds.

Frontend

JavaScript Mastery

From variables to async/await. The complete JS journey with 60+ interactive coding challenges.

Beginner → Pro 62 lessons

Frontend

React & Modern UI

Components, hooks, state management and routing. Build production apps with confidence.

Intermediate 48 lessons

Backend

Python & Backend

Scripts, APIs, data pipelines and automation. Python done right, from syntax to deployment.

All Levels 54 lessons

Data

SQL & Databases

Queries, joins, indexes and design patterns. Master the language every developer needs.

Beginner 36 lessons

Language

TypeScript Pro

Types, interfaces, generics and real-world patterns. Make your JS bulletproof at scale.

Intermediate 40 lessons

DevOps

Cloud & Deployment

Docker, CI/CD, AWS basics and production deployment. Take your apps from local to live.

Intermediate 32 lessons

Live Playground

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No setup. No environment. Just open a lesson and start coding directly in your browser with instant execution and guided hints.

script.js

index.html

style.css

Console Output

Result →

[2, 4, 6, 8]

✓ Test Passed

All 3 test cases passed. Well done!

💡 Hint

Try using .reduce() to achieve the same result in a different way!

Documentation

Reference docs,
always within reach.

Every concept has a dedicated doc page with examples, edge cases, and copy-ready code snippets.

Array.prototype.filter()

The filter() method creates a shallow copy of a portion of a given array, filtered down to just the elements from the given array that pass the test implemented by the provided function.

Pro Tip: filter() does not mutate the original array. It always returns a new array, even if no elements pass the test (in which case it returns an empty array).

Syntax

array.filter(callbackFn)
array.filter(callbackFn, thisArg)

Example — Filter even numbers

const nums = [1, 2, 3, 4, 5, 6];
const evens = nums.filter(n => n % 2 === 0);
console.log(evens); // [2, 4, 6]

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Got Hired

The JavaScript path on CODEMAVIX Learn was the first resource that actually made async/await click for me. Landed my first dev job 3 months after finishing.

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Frontend Dev · Bengaluru

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I was a designer for 6 years. The structured paths made learning React feel achievable. The live playground removed all the friction I'd always had with setup.

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Full Stack Dev · Mumbai

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Arjun Kulkarni

Data Analyst · Pune

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