flhooks 0.0.2

  • README.md
  • Installing
  • Versions
  • 63

Build Status

flhooks #

React like Hooks implementation for Flutter.

This package is inspired by React Hooks.

This is a work in progress, fell free to fork or open issues.

Why Hooks #

Like for React, Hooks try to be a simple method to share stateful logic between Component.

Getting Started #

You should ensure that you add the flhooks as a dependency in your flutter project.

 flhooks: "^0.0.1"

You should then run flutter packages upgrade or update your packages in IntelliJ.

Rules #

When using Hooks, React Hooks rules must be followed.

Only Call Hooks at the Top Level #

Don’t call Hooks inside loops, conditions, or nested functions. Hooks can only be used inside a HookBuilder builder param. They can also be used to create other hooks.

Simple Usage #

Hooks can only be used inside the builder of an HookBuilder.

HookBuilder is like a StatefulBuilder how build the builder function. Hooks function can be used only in the builder function.

// Define a Slider Page
final SliderPage = () =>
      builder: (BuildContext context) {
        // define a state of type double
        final example = useState(0.0);
        final onChanged = useCallback((double newValue) {
          // call example.set for update the value in state
        }, [example]);
        return Material(
          child: Center(
            child: Slider(
              key: sliderKey,
              value: example.value,
              onChanged: onChanged,
// Start the app
void main() =>
      home: SliderPage(),

Hooks #

Currently implemented Hooks.

useMemo #

useMemo return the memoized result of the call to fn.

fn will be recalled only if store change.

 final helloMessage = useMemo(() => 'Hello ${name}', [name]);

useCallback #

useCallback return the first reference to fn.

fn reference will change only if store change.

final onClick = useCallback(() => showAwesomeMessage(input1, input2),
  [input1, input2]);

It's the same as passing () => fn to useMemo.

useState #

useState return an HookState, HookState.value is initial value passed to useState, or the last passed to HookState.set.

Will trigger the rebuild of the StatefulBuilder.

final name = useState('');
// ... get the value
//... update the value
  onChange: (newValue) => name.set(newValue);

useEffect #

useEffect exec fn at first call or if store change. If fn return a function, this will be called if store change or when the widget dispose.

final helloMessage = useEffect(() {
  final pub = stream.listen(callback);
  return () => pub.cancel();
  }, [stream]);

useEffect is useful for handle async or stream subscription.

Custom Hooks #

Custom Hooks function can be created composing other hooks function.

Custom Hooks name must start with 'use'.

V useAsync<V>(Future<V> Function() asyncFn, V initial, List store) {
  final state = useState(initial);
  useEffect(() {
    var active = true;
    asyncFn().then((result) {
      if (active) {
    return () {
      active = false;
  }, store);
  return state.value;

Now you can use useAsync like any other hooks function.

[0.0.2] - 25/12/2018

  • added useEffect hook function
  • better dartdoc comment
  • better readme
  • added travis integration
  • added test for useEffect
  • added test for hooks function scope

[0.0.1] - 23/12/2018

  • Initial Release

Use this package as a library

1. Depend on it

Add this to your package's pubspec.yaml file:

  flhooks: ^0.0.2

2. Install it

You can install packages from the command line:

with Flutter:

$ flutter pub get

Alternatively, your editor might support flutter pub get. Check the docs for your editor to learn more.

3. Import it

Now in your Dart code, you can use:

import 'package:flhooks/flhooks.dart';
Version Uploaded Documentation Archive
1.1.0 Jan 5, 2019 Go to the documentation of flhooks 1.1.0 Download flhooks 1.1.0 archive
1.0.1 Dec 25, 2018 Go to the documentation of flhooks 1.0.1 Download flhooks 1.0.1 archive
1.0.0 Dec 25, 2018 Go to the documentation of flhooks 1.0.0 Download flhooks 1.0.0 archive
0.0.2 Dec 24, 2018 Go to the documentation of flhooks 0.0.2 Download flhooks 0.0.2 archive
0.0.1 Dec 23, 2018 Go to the documentation of flhooks 0.0.1 Download flhooks 0.0.1 archive
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Learn more about scoring.

We analyzed this package on May 8, 2019, and provided a score, details, and suggestions below. Analysis was completed with status completed using:

  • Dart: 2.3.0
  • pana: 0.12.15
  • Flutter: 1.5.8


Detected platforms: Flutter

References Flutter, and has no conflicting libraries.

Health suggestions

Format lib/flhooks.dart.

Run flutter format to format lib/flhooks.dart.

Maintenance suggestions

The package description is too short. (-16 points)

Add more detail to the description field of pubspec.yaml. Use 60 to 180 characters to describe the package, what it does, and its target use case.

Maintain an example. (-10 points)

Create a short demo in the example/ directory to show how to use this package.

Common filename patterns include main.dart, example.dart, and flhooks.dart. Packages with multiple examples should provide example/README.md.

For more information see the pub package layout conventions.

Package is pre-v0.1 release. (-10 points)

While nothing is inherently wrong with versions of 0.0.*, it might mean that the author is still experimenting with the general direction of the API.


Package Constraint Resolved Available
Direct dependencies
Dart SDK >=2.0.0-dev.68.0 <3.0.0
flutter 0.0.0
Transitive dependencies
collection 1.14.11
meta 1.1.6 1.1.7
sky_engine 0.0.99
typed_data 1.1.6
vector_math 2.0.8
Dev dependencies