Flutter and parse data objects numbers

okay, let's dive deep into flutter and data parsing, especially focusing on numeric data objects. this tutorial will cover the basics of flutter, fetching data from a source (simulated for brevity but easily adaptable to real apis), parsing json data into flutter objects, and handling numeric data within those objects.

**table of contents:**

1. **introduction to flutter:** a quick overview of flutter's core concepts.
2. **setting up your flutter project:** creating a new flutter app.
3. **defining the data model:** creating a dart class to represent your data.
4. **fetching data:** simulating data fetching (can be adapted to real apis).
5. **parsing json data:** converting json into your dart objects.
6. **handling numeric data:** integer, double, and potential issues like `null` values.
7. **displaying data in ui:** building a ui to show the parsed data.
8. **error handling:** robustly dealing with potential errors during parsing.
9. **advanced considerations:** formatting numbers, localizing, and optimization.
10. **complete code example:** a full, runnable flutter app example.

**1. introduction to flutter**

flutter is google's ui toolkit for building natively compiled applications for mobile, web, and desktop from a single codebase. key concepts include:

* **widgets:** the basic building blocks of a flutter ui. everything in flutter is a widget. there are two main types:
* **statelesswidget:** widgets that don't change their state over time. they're based on their input properties.
* **statefulwidget:** widgets that can change their state (data that can be modified) during their lifetime. statefulwidgets have an associated `state` object that manages the state.
* **declarative ui:** you describe the ui's *desired state*, and flutter takes care of updating the ui when the state changes.
* **hot reload:** a feature that allows you to see changes to your code almost instantly without restarting the app. great for rapid devel ...

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