DynamicConstructor

A package that allows you to dynamically instantiate classes by passing a constructor function and a set of parameters (List or Map). It automatically maps positional and named arguments to the constructor.

Features

  • Automatic Argument Mapping: Intelligently separates positional and named arguments from a single parameters object.
  • Support for Lists and Maps: Provide parameters as a List (where the last element can be a Map for named arguments) or as a Map for purely named constructors.
  • Type-Aware Parsing: Handles generic types in constructor signatures.

Getting started

Add dynamic_constructor to your pubspec.yaml:

dependencies:
  dynamic_constructor: ^1.0.0

Usage

Check the /example folder for a complete Flutter demo.

Basic Example

class User {
  final String name;
  final int age;
  User(this.name, this.age);
}

final constructor = DynamicConstructor<User>(
  User.new,
  ['John Doe', 25],
);

final User user = constructor.instance;
print(user.name); // John Doe

With Named Arguments

class Product {
  final String id;
  final String title;
  Product({required this.id, required this.title});
}

final constructor = DynamicConstructor<Product>(
  Product.new,
  {'id': 'P1', 'title': 'Smartphone'},
);

final Product product = constructor.instance;

Mixing Positional and Named

class Post {
  final int id;
  final String content;
  Post(this.id, {required this.content});
}

final constructor = DynamicConstructor<Post>(
  Post.new,
  [101, {'content': 'Hello World'}],
);

Additional information

For more information, bugs or contributions, please visit the GitHub repository.

Libraries

dynamic_constructor