Overview #

Arcane Helper Utils is a Dart package designed to enhance Dart development by providing utility functions and extensions that simplify common tasks.

Features #

• Ticker Utility: A utility class that facilitates time-based actions, perfect for animations or any timing-related operations.
• JSON Converter: Simplifies the process of converting JSON data into Dart objects.
• DateTime Extensions: Adds additional functionality to the DateTime class, making it easier to format dates and calculate differences.
• String Extensions: Enhances the String class by adding new methods for common transformations and checks, including JWT parsing.
• Color Extensions: Adds the ability to determine the luminance of a Color

Getting Started #

To use this package in your Dart project, add it to your project's pubspec.yaml file:

dependencies:
  arcane_helper_utils: any

Then import it in your Dart files where needed:

import 'package:arcane_helper_utils/arcane_helper_utils.dart';

Usage Examples #

Here are some examples of how to use the utilities and extensions provided by this package:

Ticker #

The Ticker can be used as a countdown or interval timer.

final Stream<int> ticker = const Ticker().tick(
  timeout: Duration(seconds: 30),
  interval: Duration(seconds: 5)
);

await for (final int ticksRemaining in ticker) {
  if (ticksRemaining == 0) print("Time's up!");
  print('Tick! $ticksRemaining');
}

JSON Conversion #

These helper methods are used in conjunction with the Freezed package to annotate fields that need to be converted from one data type to another. The available conversions are:

• String? to int?
• String? to double?

Provided the following JSON output, the valueIsMaybeNull field will be converted from an empty String to null, the valueIsDouble field will be converted from a String? to a double?, and the valueIsInt field will be converted from a String? to an int?:

{
  "valueIsMaybeNull": "",
  "valueIsDouble": "123.456",
  "valueIsInt": "123"
}

@freezed
class MyFreezedClass with _$MyFreezedClass {
  const factory MyFreezedClass({
    @DecimalConverter() double? valueIsMaybeNull,
    @DecimalConverter() double? valueIsDouble,
    @IntegerConverter() int? valueIsInt,
  }) = _MyFreezedClass;

  factory MyFreezedClass.fromJson(Map<String, dynamic> json) =>
      _$MyFreezedClassFromJson(json);

  const MyFreezedClass._();
}

DateTime Extensions #

These extensions add helpful methods to the DateTime class, making it easier to handle common date and time operations such as formatting, comparisons, and calculations.

These are broken down into the following categories:

• Start and end of period calculations
• Comparison operations
• Period information operations
• "Yesterday" and "tomorrow" getters

Start and End of Period Calculations

The following operations are now available on a DateTime object:

• startOfHour: Returns a new DateTime object where the time stamp is set to the beginning of the given hour.

  final DateTime dateTime = DateTime(2019, 1, 1, 13, 45);
  print(dateTime); // 2019-01-01T13:45:00.0
  print(dateTime.startOfHour); // 2019-01-01T13:00:00.0
  

• endOfHour: Returns a new DateTime object where the time stamp is set to the end of the given hour.

  final DateTime dateTime = DateTime(2019, 1, 1, 13, 45);
  print(dateTime); // 2019-01-01T13:45:00.0
  print(dateTime.endOfHour); // 2019-01-01T13:59:59.999
  

• startOfDay: Returns a new DateTime object where the time stamp is set to the beginning of the day.

  final DateTime dateTime = DateTime(2019, 1, 1, 13, 45);
  print(dateTime); // 2019-01-01T13:45:00.0
  print(dateTime.startOfDay); // 2019-01-01T00:00:00.0
  

• endOfDay: Returns a new DateTime object where the time stamp is set to the end of the day.

  final DateTime dateTime = DateTime(2019, 1, 1, 13, 45);
  print(dateTime); // 2019-01-01T13:45:00.0
  print(dateTime.endOfDay); // 2019-01-01T23:59:59.9
  

• startOfWeek: Returns a new DateTime object where the time stamp is set to the beginning of the week (Monday).

  final DateTime dateTime = DateTime(2023, 9, 10);
  print(dateTime); // 2023-09-10
  print(dateTime.startOfWeek); // 2023-09-04
  

• endOfWeek: Returns a new DateTime object where the time stamp is set to the end of the week (Sunday).

  final DateTime dateTime = DateTime(2023, 9, 10);
  print(dateTime); // 2023-09-10
  print(dateTime.endOfWeek); // 2023-09-17T23:59:59.999999
  

• startOfMonth: Returns a new DateTime object where the time stamp is set to the beginning of the month.

  final DateTime dateTime = DateTime(2023, 9, 10);
  print(dateTime); // 2023-09-10
  print(dateTime.startOfMonth); // 2023-09-01T00:00:00.0
  

• endOfMonth: Returns a new DateTime object where the time stamp is set to the end of the month.

  final DateTime dateTime = DateTime(2023, 9, 10);
  print(dateTime); // 2023-09-10
  print(dateTime.endOfMonth); // 2023-09-30T23:59:59.999999
  

• startOfYear: Returns a new DateTime object where the time stamp is set to the beginning of the year.

  final DateTime dateTime = DateTime(2023, 9, 10);
  print(dateTime); // 2023-09-10
  print(dateTime.startOfYear); // 2023-01-01T00:00:00.0
  

• endOfYear: Returns a new DateTime object where the time stamp is set to the end of the year.

  final DateTime dateTime = DateTime(2023, 9, 10);
  print(dateTime); // 2023-09-10
  print(dateTime.endOfYear); // 2023-12-31T23:59:59.999999
  

Comparison Operations

• isToday: Returns true if the provided DateTime is today, otherwise returns false.

  final DateTime today = DateTime(2024, 9, 10);
  final bool notToday = DateTime(2001, 12, 31).isToday; // false
  

• isSameDayAs: Compares two DateTime objects and returns true if they represent the same day.

  final DateTime first = DateTime(2001, 1, 1);
  final DateTime second = DateTime(2001, 1, 2);
  final DateTime third = DateTime(2001, 1, 1);
  
  final bool firstAndSecond = first.isSameDayAs(second); // false
  final bool firstAndThird = first.isSameDayAs(third); // true
  

Period Information Operations

• daysInMonth: Returns an int with the number of days in a provided month.

  final int daysInMonth = DateTime(2024, 9).daysInMonth; // 30
  

• firstDayOfWeek: Returns a new DateTime object where the time stamp is set to the beginning of the first day (Sunday) of the original DateTime's week.

  final DateTime today = DateTime(2024, 9, 10); // Tuesday
  final DateTime sunday = today.firstDayOfWeek; // Sunday
  

"Yesterday" and "tomorrow" getters

• yesterday: returns a new DateTime object for the previous start of day.

  final DateTime now = DateTime.now(); // 2024-10-07 13:37:48.274
  final DateTime yesterday = DateTime(0).yesterday; // 2024-10-06 00:00:00.000
  

• tomorrow: returns a new DateTime object for tomorrow's start of day.

  final DateTime now = DateTime.now(); // 2024-10-07 13:37:48.274
  final DateTime tomorrow = DateTime(0).tomorrow; // 2024-10-08 00:00:00.000
  

JWT Parsing #

These extensions enhance the String class with JWT-specific functionalities, making it easier to handle JSON Web Tokens directly as String objects.

Here are some examples of how these methods can be utilized:

• Extracting the email address (jwt["sub"])

  String jwt = "your.jwt.token";
  final String? email = jwt.jwtEmail(); // Returns the email address in the JWT
  

• Extracting the token expiration time (jwt["exp"])

  String jwt = "your.jwt.token";
  // Returns a `DateTime?` when the token expires
  final DateTime? email = jwt.jwtExpiryTime();
  

• Extracting the user ID (jwt["uid"])

  String jwt = "your.jwt.token";
  final String? uid = jwt.jwtUserId(); // Returns the UID value from the token
  

String Utilities #

The following utilities have been added to enhance working with String objects:

• isNullOrEmpty: Returns true if a String? is either null or consists of only whitespace.

  const String? nullString = null;
  const String? emptyString = " ";
  const String? nonEmptyString = "Hello World!";
  
  print(nullString.isNullOrEmpty) // true
  print(emptyString.isNullOrEmpty) // true
  print(nonEmptyString.isNullOrEmpty) // false
  

• isNotNullOrEmpty: Returns true if a String? is neither null nor consists of only whitespace.

  const String? nullString = null;
  const String? emptyString = " ";
  const String? nonEmptyString = "Hello World!";
  
  print(nullString.isNotNullOrEmpty) // false
  print(emptyString.isNotNullOrEmpty) // false
  print(nonEmptyString.isNotNullOrEmpty) // true
  

• splitByLength(int length): Splits a String into a List<String> where each value is of the maximum length provided.

  const String text = "DartLang";
  final List<String> result = text.splitByLength(3); // ["Dar", "tLa", "ng"]
  

• capitalize: Capitalizes the first letter of a given String

  const String text = "hello";
  final String capitalized = text.capitalize; // "Hello"
  

Additionally, the CommonString class provides a quick shortcut to common strings, such as punctuation marks that are otherwise cumbersome to find or type.

Color Examples #

The following utilities have been added to enhance working with Color objects:

• luminance: Computes the luminance of a given color.

  final Color luminanceBasedColor = myColor.isDark ? Colors.white : Colors.black;
  

Contributing #

Contributions are welcome! Feel free to fork the repository and submit pull requests.