📱 JavaScript Essentials for React Native

Master the JS you'll actually use — scoped to real React Native patterns

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🗺️ Course Overview

This course covers the JavaScript you'll encounter in every React Native codebase. No generic JS trivia — every lesson is anchored to a real RN pattern. The four modules build on each other, ending with a capstone where you read and explain real-world RN code.

Module	Topic	Duration
1	Modern JS Syntax You'll See Every Day	45 min
2	Functions, Scope & Closures	45 min
3	Arrays, Objects & Data Manipulation	50 min
4	JS Patterns Native Devs Must Know	40 min

Legend: 📘 Concept   🎬 Demo   🏋️ Exercise   🧠 Quiz

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📚 Curriculum

Module 1 — Modern JS Syntax You'll See Every Day  •  45 min  •  7 lessons

ES6+ patterns React Native code depends on

Core syntax

#	Lesson	Tags	Time
1	let, const & block scoping — why var is gone	📘 Concept	5 min
2	Arrow functions & implicit returns	📘 Concept · 🎬 Demo	6 min
3	Template literals for dynamic strings & JSX text	📘 Concept	4 min

Destructuring & spread

#	Lesson	Tags	Time
4	Object & array destructuring in props and state	📘 Concept · 🎬 Demo	8 min
5	Spread & rest operators — copying state the right way	📘 Concept · 🏋️ Exercise	7 min
6	Short-circuit evaluation & optional chaining (?.) in RN	📘 Concept · 🧠 Quiz	8 min
7	⚡ Module 1 mini-challenge: fix a broken RN component	🏋️ Exercise	7 min

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Module 2 — Functions, Scope & Closures  •  45 min  •  5 lessons

How React hooks and callbacks actually work

Functions deep dive

#	Lesson	Tags	Time
8	Default parameters & named arguments	📘 Concept	5 min
9	Closures explained with a real useCallback example	📘 Concept · 🎬 Demo	10 min
10	The event loop — why setTimeout behaves oddly in RN	📘 Concept	8 min

Async patterns

#	Lesson	Tags	Time
11	Promises & async/await — fetching data in React Native	📘 Concept · 🎬 Demo	12 min
12	Error handling with try/catch in async functions	📘 Concept · 🏋️ Exercise	10 min

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Module 3 — Arrays, Objects & Data Manipulation  •  50 min  •  6 lessons

Transform and render lists like a pro

Array methods

#	Lesson	Tags	Time
13	map() — rendering FlatList data	📘 Concept · 🎬 Demo	8 min
14	filter() & find() — search, tabs, and conditional lists	📘 Concept · 🏋️ Exercise	8 min
15	reduce() — aggregating totals and grouped data	📘 Concept · 🧠 Quiz	10 min

Objects & immutability

#	Lesson	Tags	Time
16	Immutable state updates — why you can't mutate in React	📘 Concept · 🎬 Demo	10 min
17	Object.keys / values / entries — iterating API responses	📘 Concept	6 min
18	⚡ Module 3 challenge: build a mini todo list state logic	🏋️ Exercise	8 min

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Module 4 — JS Patterns Native Devs Must Know  •  40 min  •  5 lessons

Classes, modules, types & real-world wiring

Modules & types

#	Lesson	Tags	Time
19	ES modules — import/export patterns in RN projects	📘 Concept	6 min
20	Truthy/falsy gotchas that break RN conditionals	📘 Concept · 🧠 Quiz	6 min
21	Nullish coalescing (??) vs OR (||) — safe defaults	📘 Concept · 🏋️ Exercise	6 min

Putting it together

#	Lesson	Tags	Time
22	Writing a custom hook from scratch using all concepts above	🎬 Demo · 🏋️ Exercise	12 min
23	🏆 Final capstone: read and explain a real RN codebase snippet	🏋️ Exercise · 🧠 Quiz	10 min

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🎯 Who This Is For

• Developers coming from non-JS backgrounds (Java, Swift, Kotlin)
• Web JS developers moving into React Native
• Freshers who know some JS but haven't used it in a mobile context
• Career switchers preparing for React Native roles

✅ Prerequisites

• Basic programming concepts (variables, loops, functions)
• No prior React or React Native experience required

🚀 After This Course

You'll be ready to dive into core React Native — components, hooks, navigation, and native modules. Check out React Native Mastery for the next step.

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Built with ❤️ by React Native Mastery