Guided Course · Foundation

React — TaskFlow Lite Application

Build a complete frontend-only TaskFlow Lite while learning state, forms, effects, composition, and component boundaries.

Track project: Build TaskFlow Lite in React. Finish the lessons, then close the transcript and build the project using evidence instead of copy-paste. Open project →

React Rendering Mental Model

Here’s the simple reason this matters: React calls components to calculate UI from current props and state. A render is a calculation, not a promise that the DOM is recreated from scratch. In this course, we connect it directly to the React version of TaskFlow Lite and the rules for state, rendering, effects, and component ownership, so you can see where the idea lives in a real project instead of memorizing a definition.

≈ 1952 words 02

JSX and Components

Here’s the simple reason this matters: This lesson is about JSX and Components. Keep the idea practical: in the React TaskFlow Lite application, the worked example should show that jSX describes the component tree and TaskCard can be reused with different props. Once you can explain why that happens, the name is much easier to remember. We connect it to the course project so you can see the idea working instead of memorizing a definition.

≈ 1982 words 03

Props and Data Flow

Here’s the simple reason this matters: This lesson is about Props and Data Flow. Keep the idea practical: in the React TaskFlow Lite application, the worked example should show that data flows from parent to child through props; the child does not silently mutate the parent’s data. Once you can explain why that happens, the name is much easier to remember. We connect it to the course project so you can see the idea working instead of memorizing a definition.

≈ 2059 words 04

Events

Here’s the simple reason this matters: This lesson is about Events. Keep the idea practical: in the React TaskFlow Lite application, the worked example should show that the browser click triggers the provided callback through React’s event handling. Once you can explain why that happens, the name is much easier to remember. We connect it to the course project so you can see the idea working instead of memorizing a definition.

≈ 1888 words 05

useState and Functional Updates

Here’s the simple reason this matters: This lesson is about useState and Functional Updates. Keep the idea practical: in the React TaskFlow Lite application, the worked example should show that functional updates each receive the latest queued value, so one click increments by two. Once you can explain why that happens, the name is much easier to remember. We connect it to the course project so you can see the idea working instead of memorizing a definition.

≈ 2022 words 06

Lists and Stable Keys

Here’s the simple reason this matters: This lesson is about Lists and Stable Keys. Keep the idea practical: in the React TaskFlow Lite application, the worked example should show that a stable domain id lets React preserve component identity correctly when the collection is reordered or updated. Once you can explain why that happens, the name is much easier to remember. We connect it to the course project so you can see the idea working instead of memorizing a definition.

≈ 2036 words 07

Controlled Forms

Here’s the simple reason this matters: This lesson is about Controlled Forms. Keep the idea practical: in the React TaskFlow Lite application, the worked example should show that react state is the current input value and every input change updates that state. Once you can explain why that happens, the name is much easier to remember. We connect it to the course project so you can see the idea working instead of memorizing a definition.

≈ 1950 words 08

Derived State

Here’s the simple reason this matters: Derived state is data you can calculate from existing state or props. Keeping it calculated instead of duplicating it prevents synchronization bugs. In this course, we connect it directly to the React version of TaskFlow Lite and the rules for state, rendering, effects, and component ownership, so you can see where the idea lives in a real project instead of memorizing a definition.

≈ 1860 words 09

Lifting State

Here’s the simple reason this matters: This lesson is about Lifting State. Keep the idea practical: in the React TaskFlow Lite application, the worked example should show that the common parent owns selection because both sibling areas need coordinated access to it. Once you can explain why that happens, the name is much easier to remember. We connect it to the course project so you can see the idea working instead of memorizing a definition.

≈ 1945 words 10

Composition

Here’s the simple reason this matters: This lesson is about Composition. Keep the idea practical: in the React TaskFlow Lite application, the worked example should show that composition lets a reusable container accept arbitrary child UI without hard-coding every use case. Once you can explain why that happens, the name is much easier to remember. We connect it to the course project so you can see the idea working instead of memorizing a definition.

≈ 1914 words 11

useEffect and Synchronization

Here’s the simple reason this matters: An Effect synchronizes React with something outside React, such as a timer, subscription, network connection, or browser API. It is not the default place for ordinary calculations. In this course, we connect it directly to the React version of TaskFlow Lite and the rules for state, rendering, effects, and component ownership, so you can see where the idea lives in a real project instead of memorizing a definition.

≈ 1897 words 12

Effect Cleanup

Here’s the simple reason this matters: Cleanup reverses an Effect before it reruns or the component unmounts. It prevents leaked subscriptions, timers, and stale async work. In this course, we connect it directly to the React version of TaskFlow Lite and the rules for state, rendering, effects, and component ownership, so you can see where the idea lives in a real project instead of memorizing a definition.

≈ 1850 words 13

Custom Hooks

Here’s the simple reason this matters: This lesson is about Custom Hooks. Keep the idea practical: in the React TaskFlow Lite application, the worked example should show that the hook packages reusable state/effect logic while each component calling it still owns its own hook state. Once you can explain why that happens, the name is much easier to remember. We connect it to the course project so you can see the idea working instead of memorizing a definition.

≈ 1991 words 14

Persistence with localStorage

Here’s the simple reason this matters: This lesson is about Persistence with localStorage. Keep the idea practical: in the React TaskFlow Lite application, the worked example should show that initial state reads stored JSON once, and later state changes synchronize back to localStorage. Once you can explain why that happens, the name is much easier to remember. We connect it to the course project so you can see the idea working instead of memorizing a definition.

≈ 1990 words 15

State Ownership

Here’s the simple reason this matters: State should live at the narrowest owner that can correctly coordinate every consumer. Server data, URL state, form state, and local UI state have different owners. In this course, we connect it directly to the React version of TaskFlow Lite and the rules for state, rendering, effects, and component ownership, so you can see where the idea lives in a real project instead of memorizing a definition.

≈ 1900 words 16

Component Architecture

Here’s the simple reason this matters: This lesson is about Component Architecture. Keep the idea practical: in the React TaskFlow Lite application, the worked example should show that components are separated around responsibilities and composition points rather than around arbitrary file size. Once you can explain why that happens, the name is much easier to remember. We connect it to the course project so you can see the idea working instead of memorizing a definition.

≈ 1940 words 17

Build TaskFlow Lite React

Here’s the simple reason this matters: This lesson is about Build TaskFlow Lite React. Keep the idea practical: in the React TaskFlow Lite application, the worked example should show that the final mini-app has one clear task owner, derived search results, controlled inputs, and reusable components. Once you can explain why that happens, the name is much easier to remember. We connect it to the course project so you can see the idea working instead of memorizing a definition.

≈ 2061 words

Track knowledge check

Check the mental models before the project

Answer from memory. If two options sound similar, explain the boundary difference before choosing.

01Which statement best explains “React Rendering Mental Model” in this track?

02Which statement best explains “JSX and Components” in this track?

03Which statement best explains “Props and Data Flow” in this track?

04Which statement best explains “Events” in this track?

05Which statement best explains “useState and Functional Updates” in this track?

06Which statement best explains “Lists and Stable Keys” in this track?

07Which statement best explains “Controlled Forms” in this track?

08Which statement best explains “Derived State” in this track?

09Which statement best explains “Lifting State” in this track?

10Which statement best explains “Composition” in this track?